Who holds the key?

Yesterday I went to get a tattoo on my chest that symbolizes a very meaningful event in my life.
 My tattoo is a superman logo with the letter "A" in the middle instead of an "S". with a keyhole in the middle of the "A". On the top and bottom it say Endless possibilities. My tattoo symbolizes a moment in my time that was Super Amazing showing me that there truly are Endless possibilities and I locked my heart up