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I agree with Meghan! They can do a reading during the ceremony, be an usher, perform a song during the ceremony if they're musically talented, be the officiant if you don't have one yet and your state allows it, etc.
What is the reason they must have a job? If someone isn't an attendant, being a guest is a huge honor. The officiant does everything related to the ceremony (readings, etc) and groomsmen often do double duty as ushers
Make them a greeter for your ceremony and/ or reception. Have them help hand out programs or sign the guest book if you have them. I’ve done this for a few of my cousins weddings and it made me feel important and involved