LOCKEY by Himitsu Magic
The item with the traditional lock and 5 keys allows to the performer to dimostrate that “only” the chosen key open the lock and the other 4 not: this demonstration is possible also with this effect?
Once the spectator chooses randomly the key and the lock and sees the keys open the lock, is possible to use the other 4 keys to verify that they do not open the chosen lock ?
Many thanks,