That's not relevant. Th U.S. export restriction does not apply to language, ethnicity, country of origin, etc. It applies to _sending_ export restricted items to (in this case) Iran.

Any sale at a brick-and-mortar store in the U.S. does not constitute export. Apple, and the store are safe from legal liability.

edit - hmm, as pointed out elsewhere, there does seem to be some cases where selling to an individual is still restricted.