Something like that indeed.
Every active network connection, every process, every piece of hardware and others are in your file system.
Then there’s also the possibility for linking to a file and links take up no space, but can show up like files.
You can use a command like ‘stat’ to get more information about a file (or directory).
That’s not what ‘keyless entry’ means. You still have to open your door, you just don’t need to press a button to unlock it first.