Restaurant man

The restaurant man is around 26 year old. He makes his living off working at the restaurant which is 3 blocks from his flat. He barely makes a living and he gets a lot of trouble at work. He has been a waiter for 5 years and hopes to keep the job. 

So when I'm acting in the role of the restaurant man I need to be desperate when asking for the cash when the group of people forget to pay. I need to show annoyance in his voice to show how he's sick of being walked all over because his living and lifestyle depends on his job