ok. was tricky but i got it to work. got out of car. popped trunk button, pressed lock button. threw key fob in trunk. closed trunk. it popped open. nice feature.
i've tested trying to lock the keys in the car by touching the black spot on the door. wouldn't lock. haven't tried with the second fob, but it would be hard to lock yourself out if you already had the 2nd fob in your hand.