I used to work at a small company that did research on a growing industry. I was there for almost two years. In that time, I wrote the SOP, trained 10 employees, and designed and printed a bunch of tools.
No one else even attempted to make the SOP and the entire company didn't have one before I started. That just shows you how much of a mess it was.
All of this was far beyond the job description. And they still laid me off after I was done training the new employees, so they could pay them less than me. Putting in extra effort can be a scam sometimes.