Questions & Answers about Магазин открывается в девять утра.
Russian uses открываться (imperfective, reflexive) here to describe what happens by itself according to a schedule:
- Магазин открывается в девять утра.
Literally: The shop opens (itself) at nine in the morning.
→ Regular schedule, focus on the process / event that normally happens.
Compare:
Магазин открывает охранник в девять утра.
The guard opens the shop at nine in the morning.
Here открывает needs an explicit subject (охранник).Магазин открыт.
The shop is open.
This is a state, not the opening event.
So открывается is natural for “the shop opens (according to its schedule)” without naming who opens it.