“The pebbled glass door panel is lettered in flaked black paint: "Philip Marlowe...Investigations." It is a reasonably shabby door at the end of a reasonably shabby corridor in the sort of building that was new about the year the all-tile bathroom became the basis of civilization. The door is locked, but next to it is another door with same legend which is not locked. Come on in--there's nobody here but me an a big bluebottle fly. But not if you're from Manhattan, Kansas.”
“In office buildings and retail premises in which entry is through double doors and one of those doors is locked for no reason, the door must bear a large sign saying: “This Door Is Locked for No Reason.”
“Why did *I* lock the door? Why did YOU lock the door? Someone locked the door...”
“Unscrew the locks from the doors ! Unscrew the doors themselves from their jambs ! ”
“My mind is a lock pick always looking for another door to open. I often find those doors by exploring minds of others...”
“The moon hangs alien, heavy, like a lock on a door; the door is tightly shut. ("The North")”