How can I unlock my Apple Watch if it's locked?
My Apple Watch is locked so how can unlocked it
[Re-Titled by Moderator]
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If this is about the Activation Lock, and the watch is still registered to a previous owners Apple Account, then the official Apple Support can only help you, if you can provide proof of ownership.
Have look at the related article:
Additional Support - Activation Lock
In case you have forgotten the passcode for the Lock Screen, check this article:
If you forgot your Apple Watch passcode - Apple Support