Have left the keys to my motorcycle in it on a couple of occasions. Not a good feeling to come out of store twice and see the keys still in the ignition one time, and in the hard saddle bag lock on the other. Lucky me, lots of thieves in the big city..
As for my garage door, in the past I've had to call the neighbors a few times because I was just not quite sure I had closed it. I now have a closer that I can control from the internet and an app on my smart phone. I can open or close it from anywhere now, and check to see it if it closed or open and for how long. I love that thing.