just was reading up on release ideas and seen the key on the wax on the lightbulb idea... you could use this in a motion detector outside your house... so while your in your slutyest outfit and tied and gagged.. you have to venture outside and keep seting off the motion sensor until the bulb heats up enough to drop the key...
probably should do a few practice runs to see if it works for sure, where the key will fall, and have a good backup just incase the light blows....