Phantom Lock Giant

You hand over a spectator a massive brass lock and ask him to open the lock, which will not work without a key. You pull out a noble, long-stemmed wine glass and tilt it to the viewer to the castle proper key in the hand. The viewer opens and closes it again and puts the lock into the wine glass. He keeps the key. They cover over the glass a pretty cloth, still shaking a little so you can hear sound in the glass castle. You shake a little harder - a clanking noise - and remove the cloth again. The castle has migrated through the glass and is tightly sealed to the glass stem. The audience itself must accept the glass and open the lock with the key, which he held all the time in his hand. New, improved version with massive security brass lock. Magic Items are non-returnable.