In you case, you may have to factory reset your phone if it's locked to be able to use it again.
There are two ways to factory reset an Android phone if you’ve forgotten the password and can’t get past the lock screen.
The first is to use Google’s Find My Device, which allows you to erase your phone online remotely. If you don’t have Find My Device turned on (it should be on by default), you’ll have to use the second method, Android’s “Recovery Mode.”