There are four workers who rehearse and act in the play the happens at the end of the play. They don't have many lines in the play, but have a lot of fun doing really bad acting at the end of the play,  so just have fun with these roles. They're not really meant to be taken seriously, and are mainly comic relief. 

I don't really mind what kind of voice you use for this, but they're probably young adult to middle aged men, so try to make them sound within that age range.