Unlocking Apple Watch
How do you unlock Apple Watch if you forgot passcode
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Put Apple Watch on its charger.
Press and hold the side button until you see the screen with the power button in the upper-right corner, then let go of the side button. If your Apple Watch has an earlier version of watchOS, you see the Power Off slider instead of the power button.
Press and hold the Digital Crown until you see the red Reset button.
Tap Reset, then tap Reset again to confirm.
After Apple Watch unpairs completely, you can pair again. Remember that you'll need the Apple ID and password that were used to set up the watch.