Always work on keeping the clubhead low after impact and keep your iron shots low. Make sure you are taking a divot after the ball. After about a month of this practice you should have made progress and all your shots should be better. I can't do it at all. To get backspin you need speed and the right angle of attack.
Nobody can spin the ball out of high fairways or out of the rough.
To understand spin, think of how a pool player hits down at the cue ball to produce backspin. That is what you need to do with your short irons to pinch the ball off the turf. You can't have loose or flippy wrists through impact. The idea is to sting the ball. My sons each use one.