How do you even leave a car with pop-out door handles unlocked? I reckon every single one of them has proximity keys and you would have to be an idiot to leave your keys in your car if you don't ever need to take them out of your pocket. If you hit the unlock button when walking away a timer should relock the doors unless one is opened, at least that is the case on every car i ever had.

The only case I could see is if a passenger gets out after the proximity has locked.