Have you encountered the bouncing car bug yet? That one was what you need to get where you could possibly step into the trap that someone (me, in my case) tried to place just outside the door.
Too bad there was a lamp above that door, and THAT is where you put them. They can't be opened or taken from there and are basically lost.
You might want to bring this... sky-rocketing trend which now cars AND traps follow to an end if you see it as important.