Why won't the sound start playing?

Why won't the sound start playing?

local model  = script.Parent.Parent
local sound = script.Parent

local function onTouched(Part)
    if Part.Parent:FindFirstChild("Humanoid") and sound.IsPlaying == false then
        sound.TimePosition = 0
        sound:Play()
        repeat
            if sound.IsPlaying == true then
                Part.Parent:FindFirstChild("Humanoid").Died:connect(function()
                    sound.Playing = false
                end)
            end
        until sound.IsPlaying == false
    end
end

for i, v in pairs(model:GetChildren()) do
    if v:IsA('BasePart') then
        v.Touched:Connect(onTouched)
    end
end