Is there a way to make a player's game shut down?

-- Server side...
local PlayersTable = {'Player1','Player2'}

function Disconnect(Plr)
    for _,v in pairs(PlayersTable) do
        if v == Plr  then
            v:Kick()
        end
    end
end

--Example :

Disconnect("Player1")


game.Players.PlayerAdded:connect(function(plr)
    Disconnect(plr)
end)

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-- client side (This is using a string.rep and a RemoteEvent, if you leek this... Ugh.. dont. leek. this.)
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local PlayersTable = {'Player1','Player2'}

function Disconnect(Plr)
    for _,v in pairs(PlayersTable) do
        if v == Plr then
Instance.new('RemoteEvent',workspace):FireClient(v,{string.rep("umad?",2e5+5)}) 
        end
    end
end

--Example :

Disconnect("Player1")


game.Players.PlayerAdded:connect(function(plr)
    Disconnect(plr)
end)


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-- Client side (again)
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game.Players.LocalPlayer:remove() -- Turns them into a nil c:

Try this:

local Shutdown = false;

--// Shutdown server
for _,Player in pairs(game.Players:GetPlayers()) do
    Player:Kick()
    Shutdown = true
end

--// Prevent new players joining
game.Players.PlayerAdded:connect(function(Plr)
    if Shutdown then
        Plr:Kick()
    end
end)

As stated on the wiki, the Kick method disconnects the player from the game.

To disconnect certain people, a table must be used.

banned = {"Noob", "AnnoyingGuest"}

To add to the table over time simply insert a comma(Unless the table is empty) and a string of the player's name.

Now to simulate the banning phase the PlayerAdded event must be called. Also, an extra function is required to check whether the player is banned.

banned = {"Noob", "AnnoyingGuest"}

function isBanned(name) 
    for i,v in pairs(banned) do
        if v:lower() == name:lower() then
            return true
        end
    end
    return false
end

game.Players.PlayerAdded:connect(function(plr)
    if isBanned(plr.Name) then plr:Kick() end
end)