There's nothing minor about it
Think of a minor as cross-training for your mind. Jobs are getting more complicated. Employers are looking for employees with a broad and flexible range of skills and abilities. You're more likely to get that job, keep it, and get promoted, if you are able to bring to your work something that others similarly trained cannot.
But career success is not the only reason to take a minor. You may also want to explore something further that interests you. Love movies? There's a minor in Film and Media Studies. Interested in why people behave the way they do? Minor in Psychology. A sports fan? Learn more about your favorite sports by minoring in Sport and American Culture. With over 50 minors in the College of Humanities and Social Sciences, there's a lot to choose from.
Best of all, taking a minor won't kill your schedule, or delay your time to graduation. Minors require between 15 and 21 credits, and all but 8 of those credits can be used simultaneously to fill other requirements. So you may be just a few courses away from adding a minor to your transcript and your resume.