Hungry Boi

redstone.setOutput('back', true)
sensor = peripheral.wrap('left')

x = 2
y = 3
z = -1
keyItem = "Pharros' Lock Stone"
openTime = 5

function getPlayers()
	local players = sensor.getPlayers()
	local names = {}
	for _,player in pairs(players) do
		table.insert(names, player.name)
	end
	return names
end

function getDataForPlayer(name)
	local success, player = pcall(sensor.getPlayerByName, name)
	if success then return player.all().living else return nil end
end

function verifyIsLooking(data)
	if data.lookingAt == nil then return false end
	local pos = data.lookingAt.position
	return pos.x == x and pos.y == y and pos.z == z
end

function verifyKeyItem(data)
	local item = data.heldItem
	if item == nil then return false end

	return item.display_name == keyItem
end

function openDoor()
	redstone.setOutput('back', false)
	sleep(openTime)
	redstone.setOutput('back', true)
end

while true do
	local names = getPlayers()
	if (#names > 0) then
		for _,name in pairs(names) do
			local data = getDataForPlayer(name)
			if data ~= nil then
				local shouldOpen = verifyIsLooking(data) and verifyKeyItem(data)
				if shouldOpen then openDoor() end
			end
		end
		sleep(.5)
	else
		sleep(1)
	end
end