To reiterate: If you use the keyfob to unlock the doors even if they are unlocked, the autolock feature will lock the doors (unless this has been disabled or a door is opened within the time limit of 1 or 5 minutes).

In Chaz's case. He got out of the car and used his keyfob to unlock the gas. This activated the autolock and since a door was not opened in the programmed time, the doors locked. If he would have opened (and closed) a door after pressing the keyfob, the doors would not have locked.