How to control multiple LEDs?

Question

Arduino

The doll house has 4 rooms, each with its own door and each LED. I want to make it so that when the door is opened, the LED in this room lights up. Ideally, the LED should be on conditionally for 30 seconds. The system should understand that the door opens by an open contact.
Prompt in what direction to dig.

Answer 1

Dig in the direction of the one vibrators.

Answer 2

For contacts - reed switch and magnet.

Answer 3

I assumed there must be some kind of control module. Not?

Answer 4

Use any small microcontroller like attiny13. Worth a penny and it will be enough for your task. Schematically, this is even easier than assembling the single vibrator proposed above. But it will be necessary to deal with the simplest programming.