Locked out of macbook air after updating to mountain lion? please help

i finally finished downloading and installing mountain lion this afternoon. i went to restart after install and now im locked out. i seem to be locked out by an old find my phone 4digit pin. iv tryed holding cmd and r when booting but it brings up another password which i dont know. please can someone advise me on what to do.
many thanks
Alex

Things like this always happen to me :(
I can remember locking it at work when my mate was playing on it so I locked it as I didn't want him on it and he knows my login pin. However it's been fine ever since this was done 5/6 months ago.
I need it for work in the morning :(
If I call apple with my serial number do you think they can help?

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