Portable Door Jammer

Wedge it under the door and the harder someone pushes, the harder it holds. That's the whole mechanism: no battery to go flat, no signal to drop, nothing to switch on. A foot of steel doing what the hotel's own lock was never quite designed to do.

Because the weak point was never the door. It was the strike plate, the chain, the housekeeper's master key, the deadbolt somebody in a corridor already has a way past. This sits behind all of it, on your side, and it doesn't care who has a key.

Fits under most doors that open inward. Goes on in a second, comes off in a second, and takes up less bag than a water bottle.