Employer Forcing Unpaid Breaks

In South Carolina. I work as a night concierge/security at a retirement home, 4:00 - 12:00 Monday through Friday. I have been in this position since September 2023 and have never had to take breaks. As far as I know, breaks aren't actually legally required but even if they were I have been said to be taking paid breaks as anything could happen at any time but it rarely does. My job is simple and involves answering the door/phone, watching cameras, and responding to a closed circuit life alert like system. However, last month I was told that due to a new policy (read big company needing to squeeze money out) I would be required to take a 30-minute break every day, putting me down to only 7.5 hours a day. The first shift has had to do this as they have coverage for the break but I was told that since there are other employees in the building during the first half of my shift I will be required to take breaks now as well (whereas third shift does not have anyone to theoretically cover so they are still exempt).

However, there is actually not anyone covering a break for me as the other employees are fully busy, and if they stayed late then they would be incurring overtime. So I am being asked to clock out for 30 minutes but still be responsible for all job duties. When I pressed my boss about this she reiterated the idea that I almost certainly have 30 minutes somewhere where I am not doing anything and that will be my break. But that is not how breaks work, I am not in any way ever guaranteed 30 minutes of uniterrupted break time because I am still responsible for all job duties even when 'on break'. And when I reiterate that point, I am essentially getting told how easy and simple my job is (the job I was hired for and am completing every duty of). My boss eventually just says that her hands are tied and I could request a raise if I want but don't expect talking to anyone above her to change the break situation.

If it were any normal job I would quit but I really doubt I'd find another job this easy that pays as much as I make, and I really can't afford any uncertainty in my budget (thus why I'm taking so much effort to get back my 2.5 hours a week).

I don't want to get legal action involved and couldn't afford it if I did, but I have done my research and as far as I can tell I am squarely in the right here. I am worried about being fired for making too much of a fuss, especially if I am in the wrong somehow. I just want to make sure that I am correct and to know what I should do from here

Thanks