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