Make Script wait until ModuleScript finished?

Hey guys. Got a bit advanced question!

Let me paste the script first Script /

while true do
		wait(5)
		if #game.Workspace.Lobby:GetChildren() >= 1 then 
			TeleportPlayers()	
			wait(1)				
			spawn(function()
				GameModules.Mode1()
				repeat						
					wait(1)							
				until #game.Workspace.InGame:GetChildren() == 1	and GameModules.GameOver == true	
				Surviver = game.Workspace.InGame:FindFirstChildOfClass('StringValue')					
				print('Stopped ',Surviver)						
			end)			
		elseif #game.Workspace.Lobby:GetChildren() <= 2 then
			print('Not enough players in-Lobby (',#game.Workspace.Lobby:GetChildren(),')') 
		end
	end

ModuleScript /

local GameModes = {}

GameOver = false

function GameModes.Mode1()
	print('Mode1')
	spawn(function(CountDown)
		for i=6,0,-1 do
			wait(1)
			print(i,' Seconds remaining')
		end
	end)
	wait(15)
end
return GameModes

I want to normal script to wait UNTIL the ModuleScript has finished (after waiting 15 seconds) before the script continues.

I attempted this by doing 'until #game.Workspace.InGame:GetChildren() == 1 and GameModules.GameOver == true'

Is it not waiting because of the Spawn(Function())?

GameOver can only be accessed from the Modulescript because you did not add it to the table that the module returns. Because of this, GameModules.GameOver will always == nil in the first script. In addition, the variable is never changed, anyways. You can make GameOver accessible to other scripts by changing it to this:

GameModes.GameOver = false

One thing to keep in mind about Modulescripts is that they only run once and then return a cached table whenever they are required, so if this causes your GameOver variable to get stuck (been there done that :/) you could do something similar using BindableEvents

Script:

while true do
        wait(5)
        if #game.Workspace.Lobby:GetChildren() >= 1 then 
            TeleportPlayers()   
            wait(1)       
	    -- having this in a separate thread might cause weird behavior because the thread will be waiting while the game is running, but the rest of the script will still be running, so I got rid of the spawn() since there isn't any reason for this to be in a separate thread anyways      
       	    GameModules.Mode1()
	--with BindableEvents, the "Event" event happens when the BindableEvent is fired. Instead of connecting to it, we can use :Wait() to halt the thread until it is fired. 
        game.ReplicatedStorage.GameOverEvent.Event:Wait()
        Surviver = game.Workspace.InGame:FindFirstChildOfClass('StringValue')                   
         print('Stopped ',Surviver)                      
        elseif #game.Workspace.Lobby:GetChildren() <= 2 then
            print('Not enough players in-Lobby (',#game.Workspace.Lobby:GetChildren(),')') 
        end
    end

Module:

local GameModes = {}

Module.GameOver = false

function GameModes.Mode1()
    print('Mode1')
     for i=6,0,-1 do
     	wait(1)
     	print(i,' Seconds remaining')
     end
    wait(15)
    game.ReplicatedStorage.GameOverEvent:Fire()
end
return GameModes