local allowed = {
 ["name 1"] = true,
 ["name 2"] = true
}

local component = require("component")
local event = require("event")
local sides = require("sides")
local redstone = component.redstone

while true do
	local _, _, username, message = event.pull("chat_message")
	if allowed[username] and message == "open" then
		redstone.setOutput(sides.front, 15) -- replace front with the correct side
		os.sleep(1) -- replace with how long you want it to stay open
		redstone.setOutput(sides.front, 0) -- replace front with the correct side
	end
end