I did everything, the scene does not start because it says that the store is closed
You are not being specific enough to answer your question. "everything" does not tell me what you did, and by "store" I'm assuming you mean the East Town bookstore.
To see Jet in the bookstore at night you must have:
- Finished all of Jet's Special (sex) Classes for both endurance and ability though level 5. Note: Not "to" but "through". You must complete level 5 until you are told you can no longer improve that stat (endurance and ability).
- You must complete Sarah's quest through step 16 in the walkthrough: Give Sara the fourth Tinymon card you get from Jazmine.
- You must visit the East Town bookstore at night, not dawning (after dark but before midnight).
If you have satisfied all of those conditions then your game state is corrupt. You could use an older save or you could check and edit a save file from when you try to enter the bookstore at night as follows:
- Switch 225 "Jet Muerta" should be false, null, or not exist.
- Switch 227 "Familia se mueve" should be false, null, or not exist.
- Switch 222 "Jet en apuro 2" should be true.
- The gun (103) should not be in your inventory.
- Variable 33 "Evento Cartas" should be >= 39. From Sarah's quest.
- Variable 46 "Special Clases" should be >= 20. From Jet's special classes.
- Variable 47 "Xpecial class Ability" should be >= 20. From Jet's special classes.
When all of these condition are true, you will be able to enter the East Town bookstore at night and see the first of the "Jet in Trouble" scenes.
If you still can't, then you're an agent from an alternate dimension and I'm not going to fall for your trans-reality paranormal hijinks! I'm burning sage as you read. <chanting mantras>