How to factory reset Macbook Air with Mavericks

I work at a pawn shop and have a Macbook air with OS X 10.9 installed.  I need to be able to reset this, so the previous owner's information is not compromised before selling it.  When powering on the Mac I am unable to use any boot commands to get to terminal or recovery options because a screen with a lock and a password entry box show up.  How can I bypass this to reset the mac?
Thanks

I have addressed the issue with the other team members going forward, but I still have potentially 1-4 months of affected inventory...which is potentially a huge financial loss. 
I don't doubt that this particular machine was tested before it was purchased, but if the general assumption was, passwords are no big deal, we can just boot to recoery mode and reset the mac later, then this would have been no cause for concern. 
either way, I have to find away around this for my current inventory.  I will get some torx screw drivers and try removing the ram.
thank you

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