Is the door locked? if it is then show the red thing that it is locked, and if it isn't locked open up the door.
Of course it's locked.
But wait how did the other guy open it? It must be a one-way lock!
open door on far left

Brick Wall, I...
Press random keys on the piano for fun
You decide that would be a bad idea for obvious reasons.
(hint hint, the op doesn't like that idea and I'm like so totally butthurt about you saying something completely insane I mean pressing random keys isn't going to do anything there's got to be some kind of pattern or puzzle. It's like, common sense bro.)
Check all of the doors. Push and pull.
PUSHING AND PULLING COMMENCED

Goddammit