When I was 16 I locked the keys in my parents old car when I drove it so many times that my father, having grown tired of coming to my rescue, put a spare key on a dog tag chain and told me to wear it around my neck. I continued locking the keys in the car when I would drive it, but it was never a problem again.

Now I keep a key chain with a yubikey on it that serves as a redundant option for 2fa to authenticate my google account, in addition to the app in my phone. I actually have two of them and the other is in a secure remote location. If you are doing anything critical in your google services you must have multiple 2fa options for disaster recovery.