[Riley85]

Kind of hard to explain but I’m talking about doors with a push bar, which most schools have.
A push bar always opens the door whether it’s locked or not.
So if she pushed on it from the inside the door will open. She can’t tell whether it’s locked from outside.
They are usually always locked unless someone uses a key to unlock it. But locked or unlocked from the inside the push bar opens the door.

[deks]

That makes sense. I have also used this type of door...you can’t get in from the outside ‘cause it’s locked, but somebody can push on the door’s push bar inside to let you in.

[Apparatchik]

You’re still not getting this. When the door closes, you push on the door, not the push bar to check if it’s secure. In fact, you can even use the push bar to pull the door closed, instead of just letting it swing shut.

Jeez.