I do not recommend writing about your coworkers. For one thing, casting your boss as a villain won't earn you a promotion, and for another, revealing your coworkers' embarrassing secrets as character traits will lose you the annual popularity contest.
However, writing about work in general terms can be a very rewarding tool. Use unimportant details about your workplace as the characteristics of places that your characters visit. Does your main character's office have an ocean view, or a view of a brick wall six inches from the glass pane? Does your fictional office have a water cooler? If so, do people tell rumors around it, or do they pick the second floor bathroom, and why?
Also, use your working experiences to address the universal truths about employment. For example: Is overtime worth the effort? How can your main character get credit for a project without ostracizing others, or avoid catching blame for something someone else did?
See the prompt above for an idea on how to get started.