Locksmith (noun)

A person who makes, repairs, or opens locks, especially for locks of doors.

Origin:

The word 'locksmith' is derived from the middle english word 'lok-smythe' meaning 'a worker in locks'.

Examples:

1. The locksmith was called to repair the broken lock on the front door.
2. The locksmith quickly opened the car door for the stranded motorist.
3. The locksmith was skilled in creating custom locks for clients with unique security needs.
4. The locksmith was able to duplicate the key for the antique lock.
5. The locksmith was consulted for advice on improving the security of the building's locks.