Don't open the door

Flip the sign over!

You try to flip the sign over but since it is just a piece of paper taped to the door you end up ripping it in half. There is nothing on the other side of the sign, but at least you now have half a paper page with "OPEN THE DOOR" on it. The "DON'T" is still taped on the wooden door. You carefully fold the paper and put it in your pocket.

>Don't open the door ! ... go all kool aid man and burst through a wall instead. Oh yeah !

You're not sure who the kool aid man is but you're pretty sure you can't burst through a wall. Still, you decide to try to bang on each of the walls just to check they are all solid. After a few minutes of banging on each wall, you reach the conclusion that they are all pretty solid.

>Maybe just... Check the doorknob, you know, see if its locked, see if you even could open the door... Thats harmless enough, yeah?

All there is left to check here is the door. It's a normal brown wooden door with a round metal doorknob. You can't see the hinges so it probably opens on the outside. You don't see any keyhole either, nor anything to lock the door. Either it's always open or the lock is on the other side of the door. You put your hand on the doorknob.
It is warm to the touch, and oddly enough you feel it is vibrating a little. You can hear a slight buzzing sound coming from the door. You try turning the doorknob and don't feel any resistance. The door is unlocked. You could open it anytime. You just need to pull.

You let go of the knob, and the buzzing sound stops.