Problems with filter from selection in listbox

I'm working on a relatively simple skills matrix for work and i want to have 2 or 3 list boxes so i can filter by employee, department and possibly skill (although im not sure that's possible the way i have the data laid out.
I can filter the data manually however not all users of the sheet will want to do it this day so listboxes with a command button seemed ideal however i just cant get it to work at all or find a solution online.
I've attached a copy of my sheet and any help would be greatly recieved