UserInputService is throwing errors when i try to lock/unlock the cursor?

here's the local script:

local userInputService = game:GetService("UserInputService")

game:GetService("UserInputService").InputBegan:Connect(function(input, gameProcessed) -- switches between default and lockcenter mouse behaviour
    if input.KeyCode.Name == "BackSlash" then
        if userInputService.MouseBehavior == 0 then
            print ("locking cursor")
            userInputService.MouseBehavior = 1
        else
            print("unlocking cursor")
            userInputService.MouseBehaviour = 0
        end
    end
end)

and i get

unlocking cursor - Client - unlockCursor:9

MouseBehaviour is not a valid member of UserInputService "Instance" - Client - unlockCursor:10

as the output every time i press backslash