First of all, it does not matter whether you are a lawful paying customer or not. If you use their parking lot, you are guaranteed to be towed. I wonder if this is how they make their money. There are actually more Jack In the Box restricted parking spots than seats in the restaurant. It's that way by design.
I came back out to my car and there was a weird guy who was touching my car and had set off my car alarm. He was already on the phone with the towing company. I just walked up to him, gave my best smile and said, "you need to get your hands off my vehicle, and get out of the way. You are impeding me leaving."
I really wish Tempe would start policing these guys.
Oh, and their food is gross, even by fast food standards. I treasure my health too much to ever attempt eating there again.