My 2012 Aveo doesn't have auto lock as standard, but it's enabled by an aftermarket alarm/ignition lock system (ignition on locks the doors). Top spec automatic 2013 Picanto does not auto lock doors either.
interesting thing I found once in my Navara. Had a 2010 4.0 litre V6 , modified.... quite a lot.
anyway. I was driving it through rivers the one day and I noticed that the doors auto unlock when the car gets really wet and wont lock again until it dries out. I thought maybe fuse or relay getting wet and was a fault. Other 4x4 chaps told me that its an aftermarket thing people put in incase you water log your car, so that you can get out if you sink the thing. clever .