We have a few dozen '10 Prius' at work. When I make stops and get out of the car, I like to lock my doors while the car is running so nobody can steal anything inside the car. I tried closing the door and touching the handle on both sides but I just get a long beep tone which lasts about 10 seconds. And sure enough, the door doesn't lock. Any help with this? I hate leaving the car unlocked and I'm used to our old cars where you were able to take the key out of the ignition and lock the doors while the car was still running.