Customer Service jobs are the entry level job for the sitdown career seeker, especially someone changing from another career, like construction, due to an injury, perhaps.
They are commonly found through temporary placement agencies due to the high rate of turnover. Very few have what it takes to handle the high stress level that comes with the high rejection rate and hostile callers. Also, high failure rates of service and product providers contribute to job dissatisfaction.
One must be highly disciplined and motivated and willing to improve those qualities to consider trying this.