In the 1990s some home security relied on a steel door club that lifted off the door and locked directly into the floor. How far the door could swing inward depended on where the floor socket was drilled, with some users allowing slight movement before the bar fully engaged. The idea was to anchor the door to the building itself rather than the frame or handle. By transferring force into the floor, the lock avoided common failure points like hinges and latches, making it especially effective for