I was terminated from my employer because I was told I had to take my 30 minute break confined to the store with the sale associate due to the store

I think this would be improper just based upon the facts as stated.  If you are in a retail place and NON exempt you should have the right to leave the premises for your break.  If you are treated as exempt, there may still be a basis for this to be unlawful.  Consult a lawyer about the termination and the pay practice and whether you might have a right to past wages and a claim under the FMWA or the FLSA or both for unlawful retaliation.  If the employer did this, they should be prepared to back up that it is a written policy first and foremost that you have read and understood.