Both of your arms are occupied with the grocery bag, so what, you can open the door with your leg. No not pushing, you can expertly wriggle your toes to open the lock!
Do I see a smug smile on your lips? Oh come on! You are the most intelligent mammal on earth, are not you?
Well, there is a horse that can do exactly that! with her mouth, she can open every lock to her stable, the stable main gate, all for one thing- some snacks!
Then there is a python, pet, that can open locked doors by maneuvering its body, and then using its body weight to open the door!