Hello and welcome,
I am sorry to hear of your difficult situation and am sorry to be the bearer of bad news.
Wage and hour laws are normally strictly enforced in CA and there are rather severe penalties for violating such laws, so I would expect to incur very significant expenses as a result of the violations unfortunately.
If you were not made aware of the violations until after you purchased the business, you may wish to consider suing the previous owner, depending on the language contained in the purchasing documents with regard to disclosures and assurances that were made.
You WILL need to retain a local attorney to represent the company and attempt to mitigate the penalties that will be assessed against you.
Here is a link to a website setting out the most common penalties assessed for such violations in CA:
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