Controlling distance out of a bunker can be done in many ways, try all these methods and see which one works best for you
Make a long, lazy, slow-paced swing to create a high trajectory. This gets the ball up high so that it lands softly and does not roll. It is a risky shot, so only play it once you have practiced it sufficiently.
Advanced players who need some help with the top of their backswing or sequence should try this drill, take your club to the top of your backswing and stop for a second before you start your downswing