The Home of Magic
This is a regular Padlock, but gimmicked in a most ingenious manner, along with several keys. Any of these keys can be "controlled" by the performer to open or not open the lock. It does not matter whether the performer or a spectator tries to open the lock, it will open or not open when handled as described. Inspired by Annemann's "Seven Keys to Baldpate", this is a completely mechanical version.