I'm unable to reset my Apple Watch says its locked
I can’t reset it it keeps saying it’s locked
[Re-Titled by Moderator]
It would depend how it is locked.
If it's second hand and is locked to the previous owner (Activation Lock) you would need to ask them to remove it from their account before you can set it up on yours.
Find out how to do that here - About Activation Lock on your Apple Watch - Apple Support