How do i stop a script from playing multiple times?

So im very new to scripting and im trying to make a block that becomes slowly more transparent when you step on it, and then deletes itself. now the script works fine but the problem is if i keep walking on the block it will play the script again and the transparency will crazy for a second and then it deletes the block. heres the script.

function touch(hit)
wait (0.3)
game.Workspace.disapear.Transparency = 0.5
wait (0.3)
game.Workspace.disapear.Transparency = 0.75
wait (0.3)
script.Parent:remove()
end
script.Parent.Touched:connect(touch)

   debounce = false
  script.Parent.Touched:Connect(function(hit)--when you touch the part it connects the hit.parent function
  if hit.Parent:FindFirstChild("the part of the player u want to look for in here")-looks for the player part
    if not debounce then--if debounce is false then it runs the lines of code
    debounce = true-- sets it to true so it wont run again
    wait (0.3)
    game.Workspace.disapear.Transparency = 0.5
    wait (0.3)
    game.Workspace.disapear.Transparency = 0.75
    wait (0.3)
    script.Parent:remove()
    end
    wait(1)
    debounce = false--sets it back to false after 1 second so the code can run again, you can ofcourse change the wait() value higher for a higher waiting time
    end

that is a code i use alot in my games and it works perfectly