Why will the player not be kicked when they reach a value in a leaderstat?

I am making a simulator game called Shard Clicker. I am trying to make a hack prevention script so when the localplayer reaches 1000000 value in Crystals that they will be kicked. Here is the script.

plr = game.Players.LocalPlayer
stat = plr.leaderstats.Crystals

if stat.Value == 1000000 then
	plr:Kick()
end

while wait(5) do
for i,v in pairs(game.Players:GetPlayers()) do
if v:FindFirstChild("leaderstats") then
if v.leaderstats:FindFirstChild("Crystals") then
if v.leaderstats.Crystals.Value >= 100000 then
v:Kick("You Have Too Much Gems")
end
end
end
end
end

i hope it worked, if it got any errors then i'm sorry, be sure to comment so i can help you

The best way is to check the value whenever it changes. This can be done by having a function fire on the Changed event of your leaderstat, which you can connect when the player enters the game. This means that this script would have to be in your Workspace.

game.Players.PlayerEntered:connect(function(player)
	player:WaitForChild("leaderstats")
	player.leaderstats.Crystals.Changed:connect(function(value)
		if (value >= 1000000) then
			player:Kick()
		end
	end)
end)

Okay, first,

Is the script a localscript? If not, that's your problem.

If not that,

player = game.Players.LocalPlayer
repeat wait() until player.leaderstats.Crystals -- Waits for the leaderstats to load in
local stat -- Provides a wait for later

wait()

stat = player.leaderstats.Crystals

if stat.Value >= 1000000 then
player:Kick("stop hacking you loser") -- Removable
end

Put this in a localscript inside StarterGear.