[Sorter]

Originally Posted by DaneMcCloud

I have a simple solution for you both:

Every time you leave the house and lock the door, say "Locked" out loud. Don't say it to "yourself", in your mind, but out loud.

By doing so, you transfer the action of locking the door while thinking about other things to the gesture of speaking. You'll never question whether or not you've locked your home again.

Will do.