Player touches npc script?

Hi I am making an SCP game and I am scripting a script for SCP 173

local part = script.Parent

part.Touched:Connect(function(hit)
    local moveable = hit.Parent:FindFirstChild("173")
    if (moveable~=nil) then
        hit.Parent.Humanoid.WalkSpeed = 1

    end
end)

I wanna make it like whenever the humanoid that has a script named "173" touched the part that I welded to the player's "HumanoidRootPart" it will be frozen. However, it didn't work. Help appreciated!