I have to have my doors locked when I"m in the car too. My car automatically does that when I shift it to the "D" gear. Sometimes when someone needs to get out and I unlock it for them, I lock it back when I drive off. I started this "lock the car" thing because I read too much on the news about people opening your passenger door while you're stopped at a light and run off with your purse. And I'm one of those ppl who put their bags on the passenger seat.