It hinges on a couple of things...
Some have hinges that swing in and out.
There are some doors I just don't enter because I'm not sure of what's on the other side.
I watch as others exit so maybe I can try to steal a peek of what's inside. I'm afraid that if I approach the door, someone will be exiting and I'll be on the ground with a concussion. Moreso afraid that on the other side will be something unfavorable. So I stare patiently until I know for sure there's something worth finding.
And that's my problem. I rely on sure knowledge rather than going on a guess. The doors eventually close and lock so I'm left on the outside wondering what was in.