It happened to me, which I didn't think was possible. I was getting done with a photoshoot and had the key in my bag. I walked near the back of my car, opened the hatch and put the bag in the back then closed the hatch. I proceeded to talk to my client and about two minutes later the horn beeped indicating it had locked. I then went over to my driver side door to put my hands in the handle to unlock with no success. I ended up calling the police to break in my car. Lesson learned: You CAN lock your keys in your car even with a push button start.