Resetting unpaired Apple Watch with broken screen

Howdy, am trying to sell an old Apple Watch 3. I have upgraded, and hence old watch is unpaired, but also has cracked screen. It is not on Find My Devices.

Holding side button until power off then holding crown until reset option comes up is not helping as the phone is cracked and cannot push the reset button.

I am happy to take into store if required.

Any help will be greatly appreciated.

Thanks

Nick