Authenticate with a physical button

I have a Raspberry PI Pico laying around and I was thinking about creating a device that, when I need to authenticate myself on Linux, I could just click a button soldered to the Pico, which would then send a message to the computer that would authenticate myself. This device would be connected to a secure computer, so no problem. The question is, how can I do it? I have no experience with Linux programming, so I don't know if there's already a service or library that could be used for that. I know that YubiKey has devices with a button that works something like that, but I also read that they need internet connection to work, which is a no-no.