So question.. just today, I picked up my wife for lunch. She had her key FOB in her jacket and I had mine in my pocket - I was driving.

When we got to the restaurant, she left her jacket in the car and we exited the vehicle (no beeping/buzzing/noises yet). After closing all the doors, I pressed on the black button to lock the doors. The TCH then started beeping continously (for a few seconds). It took me a moment to realize that it's probably warning me that there is a key FOB inside the vehicle. I then pressed on the "lock" button on my FOB and the beeping stopped and the doors locked. I figured the car would/should be smart enough to know that I have a FOB with me if I locked it from the FOB button. We then proceeded to have lunch.

What I'm wondering now is that since the FOB was inside the vehicle, could someone have walked up to the car and touch the door handle to unlock it?