Pandor’a Lock by Bob Solari circa 1985

Four spectators are selected. Each is allowed to freely select any one of the five keys shown on the handsome wood tray. One key is left for the magician (mentalist). Each spectator tries their key in the lock but it will not open. You then try your key that was left over after everyone else had picked their chosen key and to everyone’s amazement, your key works! Completely mechanical, NO force, key is NOT switched, NO sleights!