What kind of punishment are we going to get for taking $10 worth of ice cream?

You went into a closed store so you committed burglary not just theft. You could be put in a juvenile prison.

What you did is considered a burglary. Burglary is defined in California Penal Code Section 459. Every person who enters any shop, warehouse, store, with intent to commit grand or petit larceny or any felony is guilty of burglary. If the store is not used as a habitation this would be burglary in the second degree. If you were an adult, the punishment is by imprisonment in the county jail not exceeding one year or imprisonment is state prison for 16 months, two years, or three years. Because you are a juvenile, your punishment in juvenile court would be probation and classes.

This is a serious issue. It is not a shoplift. You broke into a closed store. That is breaking and entering. While in the store, you stole. You committed burglary. You could be looking at some serious detention time in juvenile court system. If you haven't told your parents, I suggest that you do so. This is very serious and could impact your future job opportunities and college opportunities. No one wants to hire someone who steals. Think about it.

You could be charged with retail fraud. The most prevalent way of dispositioning such cases is a diversion program which largely consists of community service. Upon successful completion you would not have a public record of any conviction. Speak with an attorney in your area for more particular information about how the courts in your area usually handle such matters.

You could potentially be charged with the Felony of Larceny from a Building, so I would kindly but strongly recommend you and your parents retain a Criminal Defense attorney, to ensure the least amount of damage is done to your juvenile record. Considering you only took $10 worth of ice cream, your lawyer should have a good shot at keeping your record clean. I wish you all the best of luck.