First of all, you need a pick set. If you know a locksmith, get him to make you a set. This will be the best possible set for you to use. If you can’t find a locksmith willing to supply a set, it is possible to make your own, if you have access to a grinder.
Even better would be to take a mail-order locksmith course -- at the end of one you can legally buy key blanks and so forth, and can even go into business for yourself.
How to Pick "Lock-in-Knob" Type Locks will tell you exactly what to do to defeat the "Lock-in-Knob" type locks.