Countdown / wait till function is done

[Supportic]

Hey, I just wonder if there is a way to pause a for-loop between every item.
My current approach is:

local function sleep(s)
  local futureTime = GetGameTimeSeconds() + s 
 
  while GetGameTimeSeconds() < futureTime do end
end
 
local function testSounds()
  local duration = 5
  local count = 1;
 
  for key, value in pairs(UAN.Sounds) do
    PlaySound(value)
    Util.p("[%d]: %s", count, key)
    count = count + 1
    sleep(duration)
  end
end

But the for-loop is so fast, that it stacks all sleep-calls and causes to freeze the game. x)