Trailblazer locks door while keys in ignition!

I have a 05' Chevy Trailblazer and sometimes when I leave the keys in the ignition the drivers door will lock. Usually only the drivers door lock and I have to climb in another door. Most of the time it is when it is running, but it also does it when it has been off I think. Any one know what I can do??? Thanks!!

I have a 05' Chevy Trailblazer and sometimes when I leave the keys in the ignition the drivers door will lock. Usually only the drivers door lock and I have to climb in another door. Most of the time it is when it is running, but it also does it when it has been off I think. Any one know what I can do??? Thanks!!

Install a Haida key someplace.
Keep a spar key in your pocket or billfold.
You might check the body computer and see if anything strange in there or codes.
If any codes post back code no.