I have been working at McDonald's for two years. The most frustrating thing I have come across while working there was in the beginning when I was not familiar with my work station. I was very slow and let customers wait for a long time. When I was struggling with keeping up with the fast pace environment, I would ask my coworkers who had been working there for a while how they went about getting used to it after work. They gave me tips on how to be efficient and made me more familiar with my job.