Well, it turns out we don't need extra functions for immediate unlocking and enable lockdown mode, those can easily be taken care of by calling open_lock and just seeing mode = LOCKDOWN.  Anyway, I modified the main menu so that the only options are now ENTER MASTER MODE and UNLOCK.  Wrote a function care_swipe that successfully reads in data from the magnetic card reader and displays it on the screen.  It appears to be working, I can see my MaineCard data being displayed.