Why does this time stop script i made to freeze everything then unfreeze not work?

so i made a script for stopping time and it plays the sound but doesnt do anything. it goes in startercharacterscripts if you couldnt tell

while true do
	if script.Parent.Name == "defaultkid99" or script.Parent.Name == "mahnmon" or script.Parent.Name == "doglover8775" or script.Parent.Name == "mc_campbell" then
		wait(15)
		script["STOP TIME"].PlaybackSpeed = 1
		script["STOP TIME"].TimePosition = 0
		script["STOP TIME"]:Play()
		local parts = workspace:GetDescendants()
		for i,v in next, parts do
			if v.Name == "Part" or v.Name == "HumanoidRootPart" or v.ClassName == workspace.Baseplate.ClassName then
				local oldanchor = v.Anchored
				local oldvelocity = v.Velocity
				v.Anchored = true
				script.Parent.HumanoidRootPart.Anchored = false
				script.Parent.Torso.Anchored = false
				script.Parent.Head.Anchored = false
				script.Parent["Right Arm"].Anchored = false
				script.Parent["Left Arm"].Anchored = false
				script.Parent["Right Leg"].Anchored = false
				script.Parent["Left Leg"].Anchored = false
				wait(20)
				v.Anchored = oldanchor
				v.Velocity = oldvelocity
			end
		end	
		script["STOP TIME"].PlaybackSpeed = 2
		script["STOP TIME"].TimePosition = 1
		script["STOP TIME"]:Play()
	end
end

please figure out what went wrong here.