There are notches in the keys you are using. Make them bigger with a tool like a Dremel. I had to do the same thing with the Porsche. I could get one side out, but not the other. If you do it right, you won't be able to get the keys out until the head unit is out too.
Also, stick a screwdriver into the keys and grab the handle to pull it out so you don't hurt your fingers. Good luck, let me know if you want me to come over and help.