Can someone explain to me why the humanoid speed is not being changed?

I've made this script that changes the players speed to the value in the leaderboards name called "speed" and I am trying to make sure that when their speed on the leaderboard is 0 then it would automatically put it to 16 until it goes above 16 however it only seems to stay at 16 the entire time

game.Players.PlayerAdded:Connect(function(player)
    player.CharacterAdded:Connect(function(char)
        local humanoid = char:WaitForChild("Humanoid")
		humanoid.WalkSpeed = player.leaderstats.speed.Value
		if player.leaderstats.speed.Value <= 16 then
			humanoid.WalkSpeed = 16 
		end
		 
    end)
end)

If you can explain to me what I've done wrong please do.

p.s I am new to scripting