Thrifterista, your pull string idea is great. They do sell portable retractable laundry lines at Bed & Bath stores, for less than $5 usually. But I think a wind-up doll would look great. There's an amazing tutorial on Instructables about how to make a magnetic key (http://www.instructables.com/id/Magnetic-Key/
) but if I were you I'd just make the key from cardboard and a bit of PVC, then spray paint it gold. I would keep the length to less than a foot long to attach to your back without much awkwardness. You can drill four small holes at the end of the pipe, thread sturdy wire through them, and rig it to fit you like a back pack. Does that make sense? I think a doll will look great for your face, too. Be sure to paint on big fake eyelashes and cheeks.