Thanks. I dropped my key fob in the snow a while ago and I thought it was malfunctioning.If you unlock driver's door or all doors, and don't open one, it relocks. Owner's Manual -- page 4-8.
Sounds like you could use the PDF version -- easy to find what you're looking for.
Then there are these aftermarket remote starters that will lock the doors automatically after starting, for security. On another car that I had remote started, I once put the keys on the seat to pick up the snow brush, closed the door, clear up the snow, then the engine turned off and the doors locked with the keys on the seat. Very smart!✽ NOTICE
After pressing the button, the doors
will lock automatically unless any
door is opened within 30 seconds.