Believe it or not as a locksmith, Mark's Locksmith, 503-734-8550, Tigard, Oregon, for over 10 years, I have gotten a few calls for this type of lockout. There are many people that don't know how to unlock this type of lock.

I'll show you whats inside this lock and what to fill for when opening this type of lock.

Kwikset Emergency Keys for Interior Door Locksets