I can’t unlock phone

You will need to restore the device using a computer. The process will erase the device. Later you can restore your data from a recent back-up. Instructions here…

If you forgot your iPhone passcode - Apple Support

You will be given an opportunity to set up new Passcode.

“Password”? As in your Apple ID password?

If you forgot your Apple ID password - Apple Support

If the device has a passcode, it’s not brand new in a factory sealed box.