How can I unlock my Apple Watch?

So for starters, it appears that your Apple watch is activation locked. Information for dealing with that issue is given below.

"With Activation Lock, your Apple ID and password are required before anyone can:

·       Unpair your Apple Watch from your iPhone.

·       Pair and use your Apple Watch with a new iPhone.

·       Turn off Find My on your device."

If you can't turn the activation lock off, you'll need to contact Apple support and have your purchase receipt with the watch serial number on it. See these support options:

Get a call from Apple support to help solve your problem using this link https://getsupport.apple.com/?caller=kbase&PGF=PGF63005&category_id=SC0245&symptom_id=23362

Apple ID Support https://support.apple.com/apple-id

Apple ID account security for country-specific and region-specific help https://support.apple.com/en-us/HT204169

Get Support: We’re here to help  https://getsupport.apple.com/. Go through the options to find the best support option.

See the Apple Support article(s) below.

Activation Lock on your Apple Watch