Unpaired, locked Apple watch series 2

As the title suggests, I have an Apple Watch that is unpaired and it says to many wrong password attempts, that it has to be reset and repaired. I follow the directions to hold the side button and press the power slider button to bring up the wipe menu…but the wipe menu never comes up. I’ve followed videos and I don’t know what to try next, any advice would be greatly appreciated! It was mine, and I gave it to my son who didn’t like it. It still has his information in the medical sos slider but when I redownload the Apple Watch app on his phone it only gives me the pair new watch open, when I go in to his iCloud on the computer it’s not listed as a device.