In the sims 4 the ability to lock door returns in patch 21.
Lock doors in sims 3.
The sims 2 featured a download on a unofficial site that was a 5 lock bank door were a sim with a key could lock and unlock it but people without one couldent.
While door locking settings are usually honored in some circumstances they may be completely ignored such as a burglary a repo man visit or a confiscation made by the social worker.
Once the player walks through the door.
At that point the door will open by itself.
Im sure if you ask arond the people who make realy good sims downloads you might find a sims 3 version of it or someone willing to give it a shot.
Doors and pets edit.
Is there a way to get around this b c in sims 2 this wasn t an issue.
Like the sims 3 players can restrict doors for individual sims.