I used a wet rag on the face as my threat. I only needed to use it once on DS. DD was a much slower learner ...The mini is spoiled too but I'm not getting him ready.
He has two alarms. A real clock and on his phone.
They wake me up across the house.
He's learned to get up before I make it to his room to tell him to turn them off.
This just started this school year. It's working.