The lock itself is a normal cylinder lock so it doesn't automatically lock when you shut the door.

He forgot to lock in his car and it got stolen.

This is a code lock type that you can use on the entranceway as well.

I forgot the combination to my lock.

The door is self-locking.

The lock gate controls the water flow in the canal.

I installed a mortise lock on my front door.

He bought the whole company, lock, stock and barrel.

Each of the students has his own locker.