Mrs. McCarty argues that the judge should have granted her motion for judgment notwithstanding the jury's verdict for the defendant. Her theories of negligence are that the defendant should have made sure the door was locked when she was first shown to her room ;should have warned her to keep the sliding glass door locked; should have equipped the door with a better lock; should have had more security guards (only two were on duty, and the hotel has more than 500 rooms), should have made the walkway on which the door opened inaccessible from ground level; should have adopted better procedures for preventing unauthorized persons from getting hold of keys to guests’rooms ; or should have done some combination of these things. The suggestion that the defendant shold have had better procedures for keeping keys away from unauthorized persons is irrelevant, for it is extremely unlikely that the intruder entered the room through the front door.