When I did the towing/recovery thing, part of it was lockouts. The kit we had was GREAT!
SlimJims are NOT the way to go at all. MOST cars now days have power locks. so...
The kit has 2 plastic wedges (door stops) that you tap into the door near the top/roof. This pulls the door just a bit open, and allows a nice long metal rod to be inserted. (rod is about 4 foot long and has a little hook at the end.) the hook can pull the lock button up if it can grip. if not, use the rod to press the unlock button. (its plyable, bend it to fit what you need it to) or if all else fails, hook the keys with the rod, pull them out of the igntion, and wedge the door wider to pass them by.

Now, I am not a car thief, but at the time was a towing professional. HOWEVER, said kit can be had for the right price. This is similar to the kits we had. Top of the line, expensive... and most tools unused... but a example:
http://www.awdirect.com/awdirect/cat...gory&linkid=74

but the bottom line is 2 plastic wedges and a aluminum/light strength steel rod is really all you need. this kit got me into most cars in under 15 seconds. Like anything in security, in the wrong hands, SCARY.