SUBREDDIT: r/Advice
TITLE: First time poster - just got fired but have options. Need some advice!
POST: I'm gonna preface the story with some background info: I work in a small café Inside of an office building. The cafe is mainly for the tenants. I've been there since last December and today was my "last day in the kitchen". The staff includes me (kitchen guy), a day porter, and the building manager\my boss. We have another kitchen staff lady that works mon/wed/fri. I'm there everyday in the morning at 5:30.

This morning when I walked in there was a puddle on the floor near the freezer, which is when I noticed the freezer door was slightly ajar. All of the contents in the freezer were slightly thawed and so since most of the contents in there were cooked I assumed it would be fine if I just shut the freezer and let the stuff re-freeze. 

I knew it wasnt good, but I didn't think it was a big enough deal to bother my boss about. What I didn't realize is that my mistake would've been very bad for my boss if anyone had consumed the food cause people would've gotten sick.

My boss gave me an ultimatum: either quit, get fired, or switch jobs with the day porter where I would make the same wage but with 30hr/week instead of 40. The problem is I need money and I've been pretty unhappy there since I've been there and don't really want to go back. This happened maybe 15 min ago and I was sent home to think about what I want to do. Help please reddit?
TL;DR: 
I had my last strike in the kitchen; got a choice to quit or switch jobs for less hours, but have been unhappy there and want to leave.