I have [this one](Cenow Mini Fridge for Bedroom, 10 Liter/12 Can Rapid Cooling Skincare Fridge for Cosmetics, Foods and Drinks, Portable Mini Refrigerator with AC/DC for Home, Office, Car (Black) https://www.amazon.com/dp/B082W15GQ7/ref=cm_sw_r_cp_api_glt_fabc_0C6C1X8MMKRHNQ0DHSE6?_encoding=UTF8&psc=1) and it stays very cold. We keep bottles for overnight feeds in it and they consistently feel colder than our regular fridge.

That said, its temp is based on ambient temperature. Our basement, where it lives, stays at 68ish most of the time. If your office is set on morgue like most of the ones I have worked in, it should be just fine.