You're starting in a bathroom, facing a closed door. Behind you is an open door with a mirror across from you. To the right of that mirror is another open door. Walk from where you are, just take one step into that room on the right. It's an empty closet. When you get here, turn back around and then walk into the threshold of the door you just exited. So, on your left will be the sink, and on your right is the mirror. You're done.