This is why context is key
You just answered your own question. Wait until night, choose to go out alone, then visit the shop. It might not literally say "visit the shop" the first time you unlock it but the choices should be obvious enough that you can tell which choice leads you to the shop. If you fail that, then you can always go out alone the next night and just choose the other choice.
I know what you mean but the only option i have is to go out and eat dinner with Sylvie I do not have the option to go out alone at night or the thing is the night isin't even comming because after evening they just go to sleep and the next day start again.This is why context is key
You just answered your own question. Wait until night, choose to go out alone, then visit the shop. It might not literally say "visit the shop" the first time you unlock it but the choices should be obvious enough that you can tell which choice leads you to the shop. If you fail that, then you can always go out alone the next night and just choose the other choice.