General :: Change / Remove Lock Code With Internal Class Or ADB Shell

Problem: I have one app that let's you lock the device using Device Administration. One of my users had some conflicts with my app and another. He then removed Device Administration and uninstalled my app, rebooted his phone, and now he cannot access his phone.

He of course cannot use my app to change the password now (since it's uninstalled).

His phone is stock 2.2 LG Optimus V, Virgin Mobile, Rooted.

Question:I'm needing to find a way that my user can now change his lock code.

I need:

1.) to know an internal class (from com.android.internal) that I could use within an app to change the lock code (just like the system settings do).

2.) to know a command I can use with adb shell to remove or change the phone lock code.

3.) to know the location of the file that stores the lock code information.