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Yes, adding any second language will help your employment prospects, but especially Spanish. My wife helped a friend of my son find a paid internship in Argentina while he was going to college based on expertise in Spanish; Spanish was not his first language!
Becoming bilingual does not make up for your lack of experience however it does make your resume and you more marketable. I would highly recommend learning Spanish especially if you are going to be in the Hospitality industry. You will have more skills and definitely have an edge.
It would definitely improve your resume. Any bilingual person is typically wanted in jobs, especially in the US.