Once upon a time, I tried a 5 gallon bucket with lid in the break room. It took quite some time to fill up, since me and my closest associates added to it. It was in a cabinet, so was relatively undisturbed and people were not grossed out. It was quite a pain to explain to guardians of the doors what I had and why. Because it took so long to fill, it got smelly even for me. Eventually I started taking in an empty quart yogurt or cottage cheese tub and each day put in the coffee grounds (with filter makes it easier), kept it in a cabinet or frig and bring it home each day. So the days I don't work, I don't get any. Since people have asked what I do with them, I tell them and say that I also bring home my apple cores, orange peels, etc. I now am gifted with fruit peels, often in a napkin, paper towel, newspaper or baggie. I keep a separate bag or container for those. I tend to cut up my peels to smaller pieces with scissors while watching videos! This is relatively discreet, and there are a few people I have no interest in taking home anything they touched so this is more easily avoided than a communal bucket. If anyone gives you any 'garbage' about bringing organic waste home...tell them you are saving them in trash costs and keeping your lunch room from getting smelly or keeping the fly population down in your warm seasons. It couldn't hurt to bring back in a few 'fruits of your labor". I have gifted my compost supporters cherry tomatoes, cukes, strawberries, etc. I am guessing you might grow somethings that are not sold at your place of employment!
Coffee grounds in quantity have helped heat up my compost much better than anything I have tried so far. Just go for it!