Heck, once I cycled for half an hour with my iPhone in my pocket, and somehow the phone against my leg was in just the right position that it kept interpreting my leg movements as trying to enter a passcode.

Got home, pulled out my phone, and it had a message that it was locked for several hours due to so many failed passcode attempts. Incredibly annoying.

Still, only happened once in well over a decade of owning an iPhone.

I was mostly frustrated that there wasn't some alternate way of regaining access, like via my Mac or iPad logged in with the same Apple ID. Or that the failed passcode attempts didn't start eventually playing a loud alert sound or something on each failure.