Limit user on CoursePress Pro.

Is it possible or any workaround on this:

Once they finish the online training and get their certificate or if 6 months have passed since first registered (whichever comes first) you should be locked out and not be able to log back into the training center again or be able to see other website content from trying to log in to the training center.

This is a continues course with no start and end date. but we need to be able to give lockouts for individual students after this time frame based on when they signed up.