Physical analogies for security like the one you just made are useless because they don't reflect how the computers and the internet work. You can't just ping

Physical analogies for security like the one you just made are useless because they don't reflect how the computers and the internet work. You can't just ping a rock and ask it if it's got a key. The rock isn't expected to exist in a world where some script kiddie in China is going to ask it if is has a key every 5min. The analogy simply falls flat on its face once you try to use it to reason about anything because existing as an internet connected device is far different than existing on private (but easily accessible) property.