Keys???

I was looking for a movie that I brought up from home (El Espiritu de la Colmena, which I haven't seen yet) when I came across a key attached to a light thingie and a blockbuster card.

I don't own any keys.

WHOSE IS IT???

I don't know where it came from, the only people who have been near my computer desk are Lucy, David, and April. This is a mystery. I know it wasn't there at the beginning of the year. Is it Emily's? Why would she keep a key in my drawer?

Here's a picture: