It's always going to be something, and like was said above- if they want in, they're going to get in.

I was in Alaska this summer and we managed to lock our keys in the rental Ford Expedition.
One guy grabbed a rock ready to go to town on a window when a 70-something y.o. man with us stopped him and said watch and learn.

He grabbed a stick, whittled it into a wedge and stuck it in the gap at the top of the door and body. Went over, unscrewed the antenna, then stuck it in the gap right down on the door lock switch.
Whammo- all doors unlocked instantly.

Anyone can get in any time they want....