Pent house Escape

One man was in trouble. He noticed he was being followed some people and decided to flee. During the escape he came up with a great idea - to hide in the apartment of one of the houses that were close by. A man whose house was this, suspecting something was wrong, I decided to take the key and close the unknown guest in the apartment, and the key to the apartment to hide out, to ascertain the circumstances. Your task - to help that person to get out of a rather strange room as soon as possible, using logic.