How to make a script that turns light off and then player needs to turn lights on?

First, you will need lamp models, inside the models you will need a light instance, if you set it up according to my script it will be easier, make a model then make an Attachment (Or anything else that holds the light instance) named "LightHolder", then put SpotLight or any light source in it, also if you want a switch with it make a switch model then name the clickable part "SwitchPart" then put a ClickDetector inside it, group the switch model and the light model together and name them "LightModel" and "SwitchModel" then put it in a Folder named "Lights" in the workspace, the script (Edited my answer because there was something wrong):

local Lights = workspace:WaitForChild("Lights")
local WaitTime = 30 -- You can configure how many seconds need to pass to turn off the light

for _,LightGroup in pairs(Lights:GetChildren()) do
	local Light = LightGroup.LightModel.LightHolder.Light
	local Detector = LightGroup.SwitchModel.SwitchPart.ClickDetector

	Detector.MouseClick:Connect(function()
		if Light.Enabled then
			Light.Enabled = false
		else
			Light.Enabled = true
			local i = 0 -- We set a variable so we can count how many seconds passed
			repeat -- We repeat until 30 seconds is up
				if Light.Enabled == false then -- If the light is already turned off return so it won't turn off randomly after turning on
					return
				end
				i = i + 0.1
				task.wait(0.1) -- task.wait is guaranteed to run the next frame unlike normal wait
			until i >= WaitTime
			Light.Enabled = false
		end
	end)

	if Light.Enabled then
		local i = 0
		repeat
			if Light.Enabled == false then
				return
			end
			i = i + 0.1
			task.wait(0.1)
		until i >= WaitTime
		Light.Enabled = false
	end
end