Call a church. It does not matter if you may be atheist or not. I do not know what your stand is or not on that. So I just said that.
Tell them your situation and you cannot get out and you need to eat. Tell them what you just said here. don;t think about it to much of they might say no or what ever...
Just do it. If one place says no, or does not answer. Go to the next number. Even if they cannot, just ask for ideas or if they can give you any suggestions what to do.

You can try a Salvation Army if they have those around. If they cannot help you, ask them if they have any idea, numbers or other.

Eventually I am sure someone will help you or respond.