Empty Room Escape

Remember when I escaped the car? Now I've also escaped an empty room. (Which is technically not true, since the room has not only the theoretical me in it, but also a chair and some vaults and stuff.)

See? Chair.

Just like with escaping the car, I have to click around and find objects and solve clues to figure out how to get out of the room. In this one, you have to find four keys, and each one has a letter on it, and they spell "EXIT" (which is your clue that the four keys belong to the door, I guess).

I'm free!