I discussed the slavery point below, but here let me defend its usage: it is slavery if you consider the society as a whole, not just your job.
Chances are, if you don't want to work for a year, you probably can't afford housing because you are renting. Statistically, you do not even have money to support yourself for a year. Culturally, we do not share food with strangers and neighbours, unless it's a particular event.
One side of my family is from equatorial Africa. My great-grandfather had a hut made with his own hands, and readily available food. If he wanted he could have spent his time philosophising on nature.
We have invented machines so our quality of life is much higher than him, but in exchange our time is not our own. Statistically speaking, the average Westerner, if they don't think about earning money for a year, they end up without a house, possibly starving. That fate, the spectre of that inhuman life, is the metaphorical whip of our master.
The choice is made for us.