Changing player scale on server?

This has been causing me issues for days, please help! I'm trying to make one random player on the server much bigger than the other players. Here's my script:

local AllPlayers = game.Players:GetPlayers()
local giant = AllPlayers[math.random(1,#AllPlayers)] 
local weapon = game.ReplicatedStorage["GiantClub"]

wait(5)

for i, player in ipairs(game:GetService("Players"):GetPlayers()) do
	
	if giant.Name == player.Name then
		if player.Backpack:FindFirstChild("GiantClub") == nil then
			local gunclone = weapon:Clone()
			gunclone.Parent = player.Backpack
			
			player.Character.Humanoid:WaitForChild("BodyDepthScale").Value = 4 
			player.Character.Humanoid:WaitForChild("BodyHeightScale").Value = 4
			player.Character.Humanoid:WaitForChild("BodyWidthScale").Value = 4
			player.Character.Humanoid:WaitForChild("HeadScale").Value = 4
		end
	end
end

It works locally, but on the server nothing happens. I'm running the script as a regular script in a folder in ReplicatedStorage.