The job of repairing a sock requires the use of a sewing machine. Sewing is a skill that involves stitching two pieces of fabric together using a needle and thread. It is a common task for those who work in the fashion industry, as well as for those who do repairs on clothing items. Sewing can be done by hand or with a machine, depending on the complexity of the repair. In this case, the job of repairing a sock would require the use of a sewing machine to ensure a secure and durable repair.