How fix the walkspeed of the character?

So I was making a luck based game, y'know, the norm, then i am trying to make the walkspeed 16 again, but the computer doesn't know what the humanoid is (and i know why) if that was a mouthful, you will see what i mean

local Hitable = false

script.Parent.Touched:Connect(function(hit)
    if Hitable == false then
        local humanoid = hit.Parent:findFirstChild("Humanoid")
        if humanoid~=nil then
            Hitable = true
            wait(.5)
            humanoid.WalkSpeed = 0
            local Number = math.random(1,2)
            print(Number)
            if Number == 1 then
                humanoid.Health = 0
            end
        end 
    end 
end)