players = peripheral.wrap("left")

allowedPlayers = {
  VirtualDXS=true
}

while true do
  local playersList = players.getPlayersInRange(20)
  local open = false
  for _,player in pairs(playersList) do
    if allowedPlayers[player] then open = true end
  end
  redstone.setOutput("bottom",not open)
  sleep(1)
end