I really want to walk out

I have been at my job for 2 1/2 years. My manager just called me and said she needs me to work an open to close because her man is in jail and no one can watch her 4 kids. I'm supposed to be paying my down payment for my house tomorrow. The home I live in is not ok for a child. I am trying to make a better life for my child. I was already supposed to pay the landlord but I couldn't because of the holiday yesterday. Everything was closed. I'm really stressing. What the hell do I do????

To ecerybody who suggest doing it on my lunch I live almost an hour away from work and I only get an hour for lunch