Unlock my phone when I forgot the password

We don't offer password advice because we can't see proof of ownership but in your case, Google can help you because they can see that proof.

Go into G-mail using your PC and try to log in to your G-mail address. Put any word in the password box and you will see the offer of "Forgot Password?

They then prove you are the owner of the device by asking you the answers to the security questions you set when the account was created.

That system catches a lot of thieves or folks who found a phone and decided to keep it.

Genuine owners get to change their password and WRITE IT DOWN AND PUT IT SOMEWHERE SAFE!!!