I mean, it's a patent reality.

Whether it was through serfdom, indentured servitute, state labor obligations, patriarchal labor obligations, or outright slavery - coerced human labor was a constant norm.

In Britain, quitting a job was criminal until 1875!

The idea that work is done almost exclusively through voluntary labor is a modern (post-WW2) reality, and even then mostly exclusive to Western, capitalist nations. Even in modern, non-capitalist society (Soviet Union, Maoist China) work was largely obligatory and assigned to you.

Of course, Marx would point out that all labor is obligatory if you need to work to eat. But I think he would even take for granted the ability for everyone to accept or reject what specific work they wanted to do.