noun, noun which may take the genitive case particle 'no'
automatic lock
Refers to the lock mechanism itself, often used attributively (オートロックのドア).
wasei-eigo (Japanese-coined English), from autolock
This apartment building has an automatic lock, so it feels safe.
automatic door-locking system
Abbreviation of オートロックシステム; refers to the whole system, especially in apartment buildings.
See also: オートロックシステム
The automatic locking system broke down and I couldn't get into my room.
I want to live in an apartment building near the station that has an automatic locking system.
The entrance to this office has an automatic-locking door.
I entered the passcode to release the automatic lock.
The automatic lock engages as soon as the door closes.