Answer:
What you need to do is locate which keys are sticking, the g sharp is usually under you finger that plays a g and the c sharp is about 3 pads under that. You either need a cloth, piece of laminated paper or a 5 dollar note(If Australian). You need to pry open the pad, don't force it, it should be easy to open. Then place your item in the middle, let go so it is closed with the piece of cloth etc and pull the cloth out a few times, the reason why it sticks is usually because of you saliva that can clog up the pads. If this doesn't work you will need to take it to a repairman.