Grad school in minor area

It certainly doesn’t matter for the MLS. In fact, I couldn’t tell yo where one could get a bachelor’s in library science. I can tell you it wouldn’t get you a professional library job. My question is for my son. Let’s say he minors in film studies, and has 21 hours in that discipline. Would he be able to get into a Master’s program if he decided after graduation that was where his interestswere?