Goal: Install the routine of opening the face before taking the grip
How to do it
Outside the bunker, rotate the sand wedge until the face looks at the sky (you could rest a tee on it without it falling) and ONLY then place your hands. Step into the bunker with that routine: open face first, grip second, body slightly left. Hit short shots checking that the ball comes out high and soft.
At address the sand wedge face is square or closed, as for a normal grass shot; the club buries itself when it enters the sand.
Frequently asked questions
What is the "Face to the sky" drill for?
Install the routine of opening the face before taking the grip
How do you do the "Face to the sky" drill?
Outside the bunker, rotate the sand wedge until the face looks at the sky (you could rest a tee on it without it falling) and ONLY then place your hands. Step into the bunker with that routine: open face first, grip second, body slightly left. Hit short shots checking that the ball comes out high and soft.
How long does the "Face to the sky" drill take?
About 10 minutes per session, 12 reps.
Sources
Dave Pelz — Dave Pelz's Short Game Bible
PGA of America — PGA Teaching Manual: The Art and Science of Golf Instruction