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Crenshaw Lock

High Security Locks in Monrovia · 24/7 mobile

High Security Locks in Monrovia, California

Crenshaw Lock Company installs pick-, bump- and drill-resistant high security locks and restricted keys across Monrovia, California. We are a fully mobile locksmith available 24/7, so we come to your home or storefront. Call (323) 997-8867 to talk through your doors and options.

  • Mobile to your Monrovia location
  • Available 24/7
  • Price quoted before we start
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High-security lock cylinder with a dimple key
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A high security lock is not just a stronger-looking deadbolt. It is a cylinder engineered to resist the quiet attacks that defeat ordinary hardware: picking, key bumping, drilling, and in many designs unauthorized key duplication. In Monrovia, where so many homes and shops were built long before any of those threats were considered, upgrading the cylinder and the way the door is reinforced can make a real difference without changing the character of the building.

Crenshaw Lock Company has served Greater Los Angeles and Ventura County since 1987, and owner and lead technician David Shar has spent decades working on everything from original 1900s mortise sets to modern commercial doors. We are fully mobile. There is no storefront to visit; we bring the cylinders, keys, and tools to you, whether that is a Craftsman bungalow near Old Town or a hillside home north of Foothill Boulevard.

This page explains how a high security installation works, what affects the cost, what makes our approach different, and what is specific to Monrovia's housing and businesses. If you are not sure what your door can accept, describe it when you call (323) 997-8867 and we will help you work out a sensible plan.

How it works in Monrovia

  1. 1

    Talk through your goals and your doors

    We start by learning what you want to protect and why: a recent purchase, a break-in nearby, a shop with employee turnover, or simply peace of mind. We ask about the door type, the existing hardware, and how many people need keys.

  2. 2

    Inspect the door, frame, and existing hardware

    A strong cylinder is only as good as the door around it. We check the strike plate, frame, screws, and whether the lock is a mortise, rim, or bored deadbolt. On older doors we look for wear, previous drilling, and whether original hardware can be preserved.

  3. 3

    Choose the right high security cylinder and key system

    We match a pick-, bump-, and drill-resistant cylinder to your hardware and needs. This includes deciding whether you want restricted keyways, where duplicates are controlled, or a simpler upgrade, and whether multiple locks should be keyed alike.

  4. 4

    Install and reinforce

    We fit the new cylinders, adjust the latch and bolt throw, and where appropriate add reinforced strike plates and longer screws that anchor into the framing. On vintage doors we work to avoid unnecessary cutting or new holes.

  5. 5

    Test, hand over keys, and explain care

    We operate every lock repeatedly with the door open and closed, confirm smooth operation, and hand over your keys along with any key-control paperwork or cards. We explain how to reorder keys and keep the lock working well.

Need high security locks in Monrovia?

24/7 Mobile Locksmith across Greater Los Angeles & Ventura County. We answer 24/7.

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What affects the price

  • The brand and security level of the cylinder you choose, including whether it carries restricted or patent-protected keys
  • The number of locks, doors, and gates being upgraded in one visit
  • Door type and condition, such as an original mortise set versus a modern bored deadbolt, and whether the door or frame needs reinforcement
  • Whether you need keyed-alike or master-keyed systems across several locks
  • Additional keys and key-control options, including how many copies you want at installation
  • Time of day and urgency, since we are available 24/7 and after-hours service differs from scheduled daytime work

Why Monrovia chooses us

  • Fully mobile service: we work at your door, so you see exactly what is installed and tested
  • Experience with older hardware: decades of work on mortise and rim locks means we know when to upgrade the cylinder and when to preserve period character
  • In business since 1987, with the owner personally involved in the work
  • Honest recommendations: if a standard quality deadbolt and a reinforced strike will serve you, we will say so rather than oversell
  • Residential and commercial capability, from a home gate lock to a restaurant's back door
  • No storefront overhead to justify: we explain options plainly and leave you with working keys and clear instructions

High Security Locks across Monrovia

Monrovia's housing is unusually varied for its size. In and around Old Town Monrovia, many 1900s to 1930s Craftsman bungalows and Victorians still carry original mortise and rim hardware. A high security upgrade there often means fitting a modern cylinder into the existing lock body or pairing it with a discreet reinforced strike, so the vintage door and trim stay intact. Homes in 91016 near Library Park and the Myrtle Avenue corridor are good examples of this kind of project.

Further north, North Monrovia and the foothills climb toward Monrovia Canyon Park above Foothill Boulevard. Hillside custom and mid-century homes there, many in 91016 and 91017, often sit on larger lots with long driveways and side-yard gates. Isolated entry points can be attractive to intruders, so we frequently suggest high security cylinders on side doors and gate locks as well as the front door, and keying them so one key handles everything.

In Old Town, Myrtle Avenue is a walkable strip of small shops and restaurants with mixed-age commercial locks, not far from the Aztec Hotel and the Metro A Line station. Business owners there often want restricted keys to control who can copy them, especially after staff changes. Whether you are near Mayflower Village, just off the I-210, Huntington Drive, or Mountain Avenue, we come to you at any hour. Call (323) 997-8867.

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Other Monrovia locksmith services

See all of our Monrovia services, or our citywide high security locks page.

High Security Locks in Monrovia — FAQs

What makes a lock high security?
High security cylinders are designed to resist picking, bumping, and drilling, and many use restricted keys that cannot be copied at a hardware store. They are built with tighter tolerances and hardened components compared with standard locks.
Can you upgrade the original locks on my Old Town Craftsman without ruining the door?
Often yes. We try to work with the existing mortise or rim lock body, replacing the cylinder or adding discreet reinforcement so the vintage door and hardware are preserved. We inspect first and tell you what is realistic. Call (323) 997-8867 to describe your door.
Do you come to Monrovia at night or on weekends?
Yes. Crenshaw Lock Company is 24/7 and fully mobile, so we can serve Monrovia homes and businesses outside normal hours. Call (323) 997-8867 and we will talk through the situation.
Can high security locks be installed on my gate or side door?
Yes, in many cases. Larger hillside lots north of Foothill Boulevard often have driveway or side-yard gates, and compatible high security cylinders can be fitted and keyed to match your front door.
Will a high security lock stop a determined burglar?
No lock is unbeatable, but these cylinders defeat the quiet, common methods and make forced attacks slower and noisier. The door, frame, and strike plate matter too, which is why we inspect and reinforce them.
What are restricted keys and why would I want them?
Restricted keys use a protected blank that is not sold openly, so duplicates are controlled. This suits Myrtle Avenue shops and restaurants with staff turnover, and homeowners who want to limit who can copy keys.
How is the price determined?
It depends on the cylinder you choose, how many locks are involved, the door's condition, any reinforcement, and timing. We explain the factors before work begins. Call (323) 997-8867 for guidance.
Do you have a shop in Monrovia I can visit?
No. We are a fully mobile locksmith with no storefront, which means we bring everything to your door in Monrovia and complete the installation on site.
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