lockchecker
nounUK /ˈlɒkˌtʃɛkə/
US /ˈlɑːkˌtʃɛkər/
A lockchecker is a person or tool that makes sure locks are closed and safe.
The lockchecker walked around the building to make sure every door was locked.
OTHER MEANINGS
2. A small device that tests whether a lock is working properly.
The locksmith used a lockchecker to test the new deadbolt.
3. A computer program that checks whether a file or account is locked.
The lockchecker warned us that the database was still locked.
4. A person whose job is to check locks at the end of the day.
As the night lockchecker, she was the last to leave the office.