The sun generates nearly 400 trillion trillion watts per second but don't let that fool you into thinking there's such a thing as a free lunch for more than a few billion years.
And without someone doing at least some work, you will starve no matter how many of those watts warm your reclined body.
Sure, the amount of that work is going down, and has been going down for centuries, but that's not an inevitable, natural process: The technological innovation to make food easier and cheaper to produce also requires work.
How does one go about eating the sun or the trillion trillion watts produced by sun? You need all that energy converted to something edible - that means there is at least one job, agriculture. If you can automate that, then there is the job of automation engineer. And so it goes...
Photosynthesis is ridiculously inefficient at anything but building physical materials. And it would require a whole lot of human intervention to capture more than the pinprick of insolation that happens to fall on the non-arctic, non-desert parts of planet Earth (rather than waste off into space).
