Hello and welcome,
Yes, there would typically be grounds to pursue back pay for the on-call time since the time employees were on call was so restricted in that you were unable to use the time for personal reasons.
In addition, it appears the employer break time laws, which typically require employees be relieved of ALL duties for at least 30 minutes if they work a minimum of 5 hours in a shift.
Instead of retaining an attorney, I would file a wage claim with the state labor board typically since you are concerned about the cost, since it costs nothing to pursue the matter through this agency and they do have the authority to investigate and collect wages and penalties owed by the employer on your behalf.
Here is a link to file a wage claim:
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