Cannot log in to any account

opensuse leap 42.1

I was preparing a machine for a new owner. I changed the passwords for the root and user accounts, verified that the passwords were correct.

After booting the machine today, none of the accounts are accessible, including root: invalid password.

What are my options? I obviously have physical access to the machine.

I’m just guessing but could it be that the keyboard layout the passwords were inserted in is not the same you’re typing in now?