Help with Camera moving up in Y-axis when a gun is fired?

So I have function below that is called in a function named 'shoot()' and the shoot function works but this recoil function does not work. What I am trying to do is, when the gun is shot, the camera will go up a little. Please help, there are no errors.

function recoil()
	cam.CFrame = cam.CFrame + Vector3.new(0,1,0)
end

im not sure it will work because i write in the browser but try this!

function recoil()
	cam.CameraType = "Scriptable"
	cam.CFrame = cam.CFrame + Vector3.new(0,1,0)
	cam.CameraType = "Custom" --or whatever type you want
end