Sorry if this has been posted before. I did search. Today I parked at the local retail park next to one of those windscreen repair tents. It was the only space available. I couldn't open the door because of a tent pole so I exited on the passenger side. I checked I had my fob in my pocket and walked away as normal and did some shopping. On my return, while still some distance away I noticed the headlights were still on. When I got closer I noticed he screen was on and the car was completely unlocked and awake. I tried to lock the car with the remote fob but it beeped and refused to lock. I opened and closed the driver door and tried again and it duly locked. It's probably in the manual somewhere but it's worth making the point that if you don't open and close the drivers door after parking (which you would normally of course). You CAN'T lock the car! Not ideal.