Hey Dan !
probly the lock cylinder goin out.
The typical security reset would be to attemp to start leaving the key in the "ON" positions for 11 mins, no less, then "off" for no less then 30 secs. After the third try it should reset.
A lot of the times 1-2 try gets the light off and gets you going.
Which the same will need done after replacing the lock cylinder & key.
Hope that helps, and glad to hear from ya !
