So you want to be an indentured servant?

Question: How do I become an indentured servant in this day and age?

Answer: Become a postdoctoral researcher! (post-doc, http://en.wikipedia.org/wiki/Postdoctoral_research)

See also: National Postdoctoral Association (http://www.nationalpostdoc.org/policy/what-is-a-postdoc)

Why do postdocs exist?

 Graduate schools started graduating more PhDs than there were professor positions available. (Note: this is true for the sciences, but not necessarily for other disciplines.)