Exactly this. I repeatedly check if I turned the oven off after cooking and will continue to check at least three more times before I leave the house. And maybe even go back in the house to check one final time.
I do something similar to this for many things. My go to thing is saying "CHECK" once I lock my doors to the house or close the gate, turning off a light in another room (although smart lights helped me immensely with this). A verbal or another audio cue, since most cars will beep if locked, is extremely helpful for me.
I live in a rural area and don't keep valuables in my car so mine stays unlocked at home. That plus I'd rather someone open my door, prowl through and find nothing then have a broke window because if they wanna steal my car it's a 1989 so it's easy af to start with no key so and they want it it's gonna be gone.