Click the green flag and wait until the customer tells you their order. Click the cash register and enter the customer's order. Repeat the last 2 steps until you get bored.
Background music is "Relaxed Scene" by James Clarke Sonical Hallo by sonically_sound -- freesound.org/s/683160/ -- License: Attribution NonCommercial 4.0 Regular Hallo by @Landonthecoolest -- scratch.mit.edu/projects/1111641611