Lunch options are unlimited if you are willing to cook on the weekend and take meals to work. All the recipes here http://forum.lowcarber.org/forumdisplay.php?f=2. Are indexed and hyperlinked.
For even simpler ones, I’m currently enjoying the "Keto Plate" ideas on DietDoctor, search for that term here: https://www.dietdoctor.com/low-carb/recipes
Another source for creative "low carb or Keto lunch" ideas is Pinterest.
Kristie has a few YouTube videos on packing lunches.
http://forum.lowcarber.org/showthread.php?t=470795