With the stairs behind you, walk down the hallway in front of you. Walk all the way down the hallway until you run into a door. Stop just before entering the room with the table and chairs.
Leave the closet, and head through the glass doors ahead. Walk down the hall. Stop outside of the room at the end of the hall.
Go through the glass doorway into the hallway straight ahead, continue down to the end of the hallway until you reach the door frame.