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Crenshaw Lock

Master Key System in Glendora · 24/7 mobile

Master Key System in Glendora, California

Crenshaw Lock Company designs and installs master key and restricted key systems with key control throughout Glendora, California. We are fully mobile and available 24/7, coming to your building rather than asking you to visit a shop. Call (323) 997-8867 to plan a system that fits your doors and your people.

  • Mobile to your Glendora location
  • Available 24/7
  • Price quoted before we start
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A master key system lets different people open different doors with the right key, while one top-level key opens them all. A tenant opens only their suite, a maintenance tech opens the utility rooms and common areas, and an owner or property manager holds the key that opens everything. Done well, it replaces a jangling ring of twenty keys with one key per person, and it gives you a real record of who holds access to what.

Glendora is a good example of why one design never fits every property. Glendora Village has historic early-1900s buildings and boutique storefronts where the doors, frames and hardware may be older and varied. Along Grand Ave, Glendora Ave and Lone Hill Ave you will find offices, retail, medical suites, and small multi-tenant buildings. Near Citrus College and across the foothill neighborhoods, there are properties with shared entries, outbuildings and gated access, each needing a different approach to who can open what.

Crenshaw Lock Company has served Greater Los Angeles and Ventura County since 1987, and owner and lead technician David Shar brings that experience to system design. We are mobile only. We come to the property, look at the actual doors, talk through how your people move through the building, and build a plan around that, with key control so the system stays secure after the install day.

How it works in Glendora

  1. 1

    Walk the property and map the doors

    We start on site by listing every door that needs a lock: exterior entries, suites, storage rooms, utility and mechanical rooms, gates and outbuildings. We note the existing hardware, door condition and frame type, because older storefronts and newer tract-style offices often need different solutions.

  2. 2

    Define who needs access to what

    Next we build an access hierarchy with you. Typically that means a grand master, one or more master keys for departments or floors, and individual change keys for single doors. We ask about staff turnover, contractors, cleaners and tenants, since those answers shape how many levels the system needs.

  3. 3

    Choose key control level

    Standard keys can be copied at almost any hardware store. If you want control over duplication, we discuss restricted keyways, where key blanks and cutting are controlled so copies require authorization. We explain the tradeoffs openly, including how much flexibility you give up for tighter control.

  4. 4

    Pin the cylinders and install

    We pin or replace cylinders to follow the design, install them at each door, and test every key against every lock it should and should not open. Where a door's existing hardware cannot support a good cylinder, we tell you before we replace anything.

  5. 5

    Document the system and issue keys

    We provide a clear key schedule that records which key opens which doors, and we help you set up a simple sign-out process. Keeping that record current is what makes the system useful years later, when a tenant leaves or an employee turns in a key.

  6. 6

    Plan for growth and changes

    Businesses change. A good master key system leaves room to add doors, tenants or new key levels later without starting over. We note that capacity in the design, and you can call (323) 997-8867 whenever you need to expand, rekey a suite or retire a lost key.

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What affects the price

  • The number of doors and cylinders in the system, since each one needs to be pinned or replaced to fit the design.
  • How many access levels you need, such as grand master, department masters and individual keys, which affects design complexity.
  • Whether you choose standard keyways or a restricted, key-controlled system with protected blanks.
  • The condition and type of existing hardware, including older Glendora Village doors that may need new cylinders or other lock work to accept the system.
  • Whether you are converting existing locks or installing entirely new hardware on some or all doors.
  • The number of keys to be cut and issued, plus any after-hours scheduling for a business that cannot be interrupted during the day.

Why Glendora chooses us

  • Fully mobile service. We design and install at your property, so we see your real doors instead of working from a guess.
  • In business since 1987, which means decades of experience with commercial cylinders, keyways and the problems that crop up in mixed-age buildings.
  • Owner involvement. David Shar leads the work, so the person planning your hierarchy is the same one who knows how it will behave in practice.
  • Honest advice on key control. We explain what restricted keys actually protect against and where their limits are, rather than overselling.
  • Available 24/7 for urgent needs, such as a lost master key or a sudden staff departure that calls for quick rekeying.
  • Clear documentation. You get a key schedule you can actually use, not just a bag of keys.

Master Key System across Glendora

Glendora's character shows up in its buildings. In Glendora Village, the historic downtown, early-1900s structures and boutique storefronts often have older doors and frames, sometimes with a mix of locks added over decades. A master key system for a small multi-tenant building in the 91741 area can tidy that up, giving each shop its own key while the property owner keeps a master for emergencies and maintenance. We look closely at the hardware first, since some historic doors need careful handling.

South Glendora is largely post-war single-family tract, but the streets around Lone Hill Ave and Glendora Ave also include offices, medical suites and small commercial properties that benefit from structured key control. Near Citrus College and along Route 66 (Alosta Ave and Foothill Blvd), businesses with several employees and shared rooms often find that one master key and a few change keys are far more manageable than a drawer of unlabeled copies.

North Glendora, with its foothill estates, brings a different need. Larger custom homes, gated drives and outbuildings can be tied together under a restricted system, so a property manager, housekeeper or contractor has access only where appropriate. Properties near Big Dalton Canyon and the foothill trailheads in the 91741 and 91740 ZIP codes also deal with dust and grit during Santa Ana wind season, which can foul locks, so we consider cylinder quality and maintenance when designing a system. Wherever you are in Glendora, we come to you, any hour. Call (323) 997-8867.

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Other Glendora locksmith services

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Master Key System in Glendora — FAQs

What is a master key system?
It is a lock and key design in which each lock has its own key, and higher-level master keys open groups of locks or all of them. It reduces the number of keys people carry while keeping a clear hierarchy of access.
Can you convert my existing locks in Glendora to a master key system?
Often yes. If your current cylinders and hardware are in good shape, we can rekey or replace cylinders to fit a new design. Older doors in Glendora Village sometimes need hardware attention first, and we will tell you on site. Call (323) 997-8867 to start.
What is a restricted key system?
A restricted system uses a keyway with controlled blanks, so duplicates require authorization instead of being cut at any key shop. It adds meaningful control over who can copy keys, though it works best with a sign-out process.
Is a master key system less secure than individual locks?
A master system adds some complexity, which a careful design handles. Fewer access levels and quality cylinders reduce risk. We explain the tradeoffs openly so you can pick a balance that fits your property.
How do I handle a lost master key?
Treat it seriously. Depending on the level of the lost key, we may need to rekey the affected locks or the whole system. We are available 24/7, so you can call (323) 997-8867 any time to discuss next steps.
Do you serve properties near Citrus College and North Glendora?
Yes. We are fully mobile and serve all of Glendora, including the Village, South Glendora, areas around Citrus College and the foothill neighborhoods in the 91740 and 91741 ZIP codes.
Can I add doors or tenants later?
Yes, a well-planned system leaves room for growth. We note spare capacity in the design and keep a key schedule so additional doors, suites or key levels can be added without starting over.
Do I need to visit your shop to set this up?
No. Crenshaw Lock Company is mobile only, with no storefront. We come to your Glendora property to assess, design, install and test the system.
DS

Reviewed by David Shar — Owner & Lead Technician

Crenshaw Lock Company has served Greater Los Angeles & Ventura County since 1987.

Last updated 2026-10-12.

Call (323) 997-8867 · Open 24/7