Consulting the Corpus of Contemporary American English, one finds it four times in transcripts of unscripted television interviews. A guest says to Sanjay Gupta "Thanks," and Gupta responds (twice) "You got it." Once for Peter Greenberg and once for Dave Karger.
These are journalists and not service workers, so I think it would be fair to say that the phrase has established itself as an informal way of saying "you're welcome."
Here's a full example with context from an interview of Tiger Woods by Jimmy Fallon.
Fallon: “I want to say thank you for having the courage to come on a late
night comedy program…. It must have been a painful and awful
situation, the whole thing you went through, but from a comedian’s
standpoint, and my monologue writers’, thank you so much. That was
some of the greatest comedy we did ever. I mean, you must have heard
every golf joke in history, but that is like a magical thing to
happen, your awful pain. And we laughed at your pain, and I mean, not
even making jokes — it kinda wrote itself. I mean, ‘balls,’ ‘shaft,’
‘holes,’ ‘foursomes.’ I mean, it really writes itself. I just want to
say, thank you. thank you, thank you.”
Woods: “You got it.”