Look, it’s in space. It was long, long ago in a galaxy far away. You just can’t see the pockets, they’re space pockets, much cooler than regular pockets.
I don’t know of any handguns small enough to fit into a petri dish. The handgun must be loaded and fired at the petri dish. A large caliber will be easier to aim since it would decrease the need for accuracy. Close range is a better distance. Shotguns and machine guns would do an even better job, rifles are fine. A sword decreases the likelihood of destroying a virus because of its low energy. Standing on a chair while wearing a lab coat makes you look cooler. Two hands can be used to aim the gun if it helps you. The handgun will not fire with the safety on, thus decreasing the probability of destroying the virus.
Sure, more dancing in the workplace would be nice, but on a desk seems like an OSHA violation. Also, you’d have to move the monitor, keyboard and mouse out of the way.