Sentence:  Back at the Factory-to-You with the other old maids , back there she was the youngest clerk and she was thirty-four , which made her young enough to resent the usual ideal working conditions , like the unventilated toilet with the <WSD>door</WSD> you had to hold shut while you sat down . 
Meaning of the word marked with <WSD> tags:  a swinging or sliding barrier that will close the entrance to a room or building or vehicle