Should have just called it Mayhem part 2
This is basically a carbon copy of 2017s Mayhem.
shareOffice Uprising sounded like it could have been an older script, though. At one point, a woman says "emoticons" instead of emojis.
shareOr a very near copy of The Belko Experiment from 2016.
Sealed office building, workers killing each other, the main boss was played by the same guy from Office Uprising. No zombie stuff though.