The ability to knock on someones door and being "let in"

It would be nice to have the ability to knock on a door. Sometimes interiors aren’t used that much because people have to lock the door to avoid people just randomly entering uninvited, but there is also no way to ask to be let inside without somehow getting the person inside to let you in. And they obviously have no idea if you are trying to get in.

I’m imagining it being a simple button press you have to hold down like the lock and unlock, (optional: play the knock animation but then again people should just do that themselves) if someone is inside they would get an alert that someone is at the door.

Optionally there could be the ability to accept or deny entry, giving the other person a message like “come on in it’s open!” or “come back later.” But that might be unnecessarily complicating it.

I know this isn’t the most NEEDED feature but I think it could do a lot for making people actually spend more time in interiors.