Lambda calculus is more-so a construct from Theoretical Computer Science than really a programming language. I’m guessing, you got taught that, because universities want to do science, they don’t want to just train you for a job.

But lambda calculus did serve as pretty big inspiration for the programming language LISP. And Clojure is a LISP dialect. So, if you squint at Clojure, you can actually still see the structure of lambda calculus.