I'm not sure if this is correct, can you look at this for me? [closed]

Basically, I am making a script where you have to press Q on the keyboard and the player will get faster but for some reason it is not working. When i run it a press q is says this:

13:46:19.046 - WalkSpeed is not a valid member of Model

so is it saying the walkspeed is not a value in the humanoid model

local humanoid = game.Players.LocalPlayer
sprinting = true
game:GetService("UserInputService").InputBegan:connect(function(input)
    if input.KeyCode == Enum.KeyCode.Q then
        humanoid.Character.WalkSpeed = 40
        end
end)