iPhone 5 lock screen sounds have stopped

The Lock Sounds and Keyboard Clicks have stopped working on my iPhone 5. I've tried going into Settings Sounds and turning off Change with Buttons, Keyboard Clicks and Lock Sounds then turning them back on and that didn't work. Other sounds such as Alarms and Music are still working, it seems that just the Keyboard Clicks and Lock Sounds have stopped. Does anyone know how to fix this?