I dont have door panels on my car...and so ive looked at the locking mechanism in some detail... I wasnt always a "good" kid.

If you take a coat hanger, and put it in the door, and then push it down maybe a foot, and then turn it so that the hook faces towards the passenger side, you should be able to just pull up the bottom lever, and with enough force (youll pull it about 2-3" up) it will unlock the door. Then use the handle.

Besides, its always good to know how to break into your car, because **** happens. Next time (if you manage to lock the spare and your regular into your car) just grab a metal coat hanger and try it. Hell, even if you dont lock your keys in, practice a little bit.