Apple watch unlock issues

I am having a strange issue with my Apple Watch (Series 1). The watch is locked and I can't seem to unlock it. I have unpaired the watch from my phone, but the watch still seems to be locked! It advices me to unlock it from my phone, which it is not paired with! I have tried the hard reset -

1. put watch on charger
2. press down on the side button until the power off screen appears
3. firmly press on the power off button without sliding (sliding isn't active when the watch is charging!)

problem is nothing happens when I press on the power off button! All the instructions say that when I press firmly, the reset option should appear, but nothing seems to happen!

Help please...the apple watch is currently unusable..

Thanks, much appreciated.