No it wasn't.

It was humans, they found the villages of the workers by the pyramids. They found the skeletons of the workers.

It was voluntary, it was a time of great prosperity and happiness for the Egyptian people. They were well paid and well fed. Also given lots of beer.

They found graffiti from workers all through the pyramid in places only the workers could have been.

There's lots of proof of all this.

Also the symbology of the pyramid has been warped since then, it was supposed to represent those closest to God at the top, not the richest or most powerful.