Why datastore does not save the value?

I'm sorry, I use Google translator!

local DataStore = game:GetService("DataStoreService"):GetDataStore("PlayerStats")



game.Players.PlayerAdded:connect(function(player)
    local playerKey = "user_" .. player.userId
    local leaderstats = Instance.new("Model")
    leaderstats.Name = "leaderstats"
    leaderstats.Parent = player
    local Wins = Instance.new("IntValue")
    Wins.Name = "Wins"
    Wins.Value = DataStore:GetAsync(playerKey)
    Wins.Parent = leaderstats
    print(playerKey)
    while wait(5) do 
    for _, player in ipairs(game.Players:GetPlayers()) do
        if player:FindFirstChild("leaderstats") then
            player.leaderstats.Wins.Value = player.leaderstats.Wins.Value + 1
            DataStore:SetAsync(playerKey, Wins)

        end
    end
end
end)

if you remove the "DataStore: GetAsync (playKey)", the leaderboard will show Wins, but will not save

But if you leave this line, it will not save, as well as leaderboard will not show Wins