Most players are trying to lift the ball in to the air. This causes a right hand player to scoop and flick the club upward with their right hand. Start simple by removing the right hand entirely off the grip, using only your left hand. Ford press the butt of the grip to be positioned ahead of the ball at address. Now have them brush the grass as they stroke( no digging ) Let them learn that the loft of the club will get the ball airborne.