does anyone know how to fix a key that sticks a little without calling a repair man?

Yr key`s action is getting retarded. I dun think u can fix it yrself. Get the tuner to do it for u. But sometimes I just hold the surrounding octs ( for the same note) then I hit the actual key as hard and fast as i can. It will bounce right back. Dun ask me the reason 4 doing this, I dunno why. This method was taught by my friend.