I actually just hired someone who had "soccer ref" on their resume, and it came up while I interviewed him. As an employer I do see sport officiating in a couple of lights - one is about a balanced life that involves more than just your job, much like playing sports, or volunteering, or some hobbies. The other is about the skills and requirements that are definitely transferable to any workplace - integrity, situation management, dealing with diverse sets of people, dealing with emotional people, dealing with conflict, mediation, sticking with a hard decision, learning from mistakes, self improvement, working with a team (partner) to a common goal, etc.
I recommend you highlight those items during an interview - those skills are valuable and apply almost everywhere. Don't be afraid to use umpiring situations when asked those typical HR-provided questions about conflict, or making mistakes, or naming one of your faults.
Playing team sports at a competitive level and officiating sports, when on resumes, jump out at me like beacons. High level team sports provide invaluable experience in collaboration and time management, especially during school - show me someone who can balance schoolwork, team practices, team travel, part time job, and a social life, and I'll show you a rock star you want working for/with you for years. Show me someone who can work a full time job, umpire evenings and weekends, continuously improve both, and have a family/social life - why wouldn't you want that guy on your team?
And to just level set the type of people I'm hiring - it ain't burger flipping or anything remotely resembling minimum wage. Post-university, professional, anywhere from 5-20 year industry experience.