CFrame not working because Vector3 expected?

game.Players.LocalPlayer.Character.Humanoid.WalkSpeed = 0
player = game.Players.LocalPlayer
hum = player.Character

--[[function onKeyPress(inputObject, gameProcessedEvent)
	if inputObject.KeyCode == Enum.KeyCode.W then
		hum.Torso.Position = hum.Torso.Position + Vector3.new(0,0,5)
	end
end
 
game:GetService("UserInputService").InputBegan:connect(onKeyPress)--]]

function onKeyPress(inputObject, gameProcessedEvent)
	if inputObject.KeyCode == Enum.KeyCode.W then
		hum.Torso.CFrame = hum.Torso.CFrame + CFrame.new(0,0,5)
	end
end
 
game:GetService("UserInputService").InputBegan:connect(onKeyPress)

the commented part is the vector3 one that didnt have any errors, but detached me torso from the character. i wanted to use CFrame because i want the rest of the player to move with the body.