how to make this script give damage/hurt npc?i need help it will not do any damage i need help plz? [closed]

local enabled = true
Player = script.Parent.Parent
--Player:WaitForDataReady()
mouse = Player:GetMouse()
run = game:GetService("RunService")
function onKeyDown(key)
if not enabled then return end
enabled = false
    Key = key:lower()
    if key == "q" then
        RightShoulder = Player.Character.Torso["Right Shoulder"]
        LeftShoulder = Player.Character.Torso["Left Shoulder"]
        Run = game:GetService("RunService")
            for i = 1, 12 do
                LeftShoulder.C0 = LeftShoulder.C0 *CFrame.Angles(0, 0, -0.10)
                LeftShoulder.C0 = LeftShoulder.C0 *CFrame.Angles(0, -0.1, 0)
                Run.Stepped:wait(0.00)
            end



        wait(0.0)
        for i = 1, 12 do
            LeftShoulder.C0 = LeftShoulder.C0 *CFrame.Angles(0, 0.1, 0)
            LeftShoulder.C0 = LeftShoulder.C0 *CFrame.Angles(0, 0, 0.1)
            Run.Stepped:wait(0.00)
        end
    end
wait(.0)
enabled = true
end

mouse.KeyDown:connect(onKeyDown)