A retail key holder is in charge of opening and closing a retail store. You also perform day-to-day operational duties like helping both cashiers and customers as needed. From open to close, you supervise the after-hours cleaning staff and set the alarm before leaving. You are often a manager who is third in line after the assistant manager. Customer service and supervisory skills are vital for this career, and you need to have on-the-job experience working in retail or customer service. Qualifications begin with a high school diploma.