Locked out of brand new MacBook after Migration Wizard

Hi all

i am in the process of setting up my new MacBook Air. I used Migration Wizard to transfer everything over but when the new MacBook restarted, it wouldn’t accept my sign in password. I’m now locked out of it.

im getting no options to reset password or anything. Just “enter password” which, when I get it “wrong”, makes me wait an increasingly long period before I can try again.

Help!