Locksmith
Downey.
The address may be right. The entrance can still be wrong.
A front shop door, a side access door and a separate upstairs suite can share a street address. For a locksmith visit in Downey, make the particular entrance part of the request.

Keys, doors
& everyday access.
Name the door that needs attention
Downey Avenue and Firestone Boulevard help orient a request around Downtown Downey. They don't tell someone which door holds the faulty lock. A suite number or separate entry can make that clear.
At a business, establish whether the work is on the tenant's own door or a shared building entrance. The owner or manager may control the common locks and key arrangement.
The same point applies at an apartment. Getting through a lobby door is different from opening a unit. If you rent, check what changes the manager allows before requesting replacement hardware.
What has changed since it last worked well?
A door may have begun rubbing against the frame. A handle may feel loose. A key may need a hard turn only when the door is shut. Each is more useful to describe than a guess that the whole lock has failed.
A lock repair discussion looks at supported hardware and the entrance together. A latch needs to meet its strike properly, and a bolt needs space to move without pressure.
If you have a spare key, note whether it behaves the same way. Don't force a bent key or start taking the lock apart. Those observations can be made without changing the hardware.
A missing spare raises another question
If the lock works but you no longer know who has a key, the concern is access control rather than a mechanical fault. Rekeying may let you keep a sound compatible lock while making a new key work.
Count the locks involved rather than just the doors. Some entrances have a separate deadbolt and handle lock. A side door may use another key system.
At a shop, also decide who needs the new copies. Getting a key back from one person does not prove that another copy was never made. A clear key list is easier to maintain after the work.
Review the result in normal use
Close the door without lifting, slamming or pulling it into a special position. Try the agreed keys. For a business, watch whether the closing door catches cleanly rather than just touching the frame.
This page does not represent a Downey branch. LockReach's published dispatch point is in Inglewood, so check the address and job at 424-732-7324. Any longer-trip or other applicable charge should be part of the discussion, with the work agreed before it starts.