As an employer, honest is the best policy. “I was underage and caught drinking. Learned my lesson, blah, blah, blah.”
If you don’t tell, it WILL show up on a background report. Even if I thought it wouldn’t show up as a juv, I think I’d admit it. Shows maturity.
EVERYBODY gets background reports ESPECIALLY when there are kids involved. I ROUTINELY have them run on me for Make-A-Wish, Kiwanis, Scouting, Civil Air Patrol & a museum I volunteer at. You can bet that Disney surely does.