몇시에 문닫습니까?
What time does the store close?

몇시에 엽니까?
What time does the store open?

Not common ways to say the same shite:
몇시에 폐점합니까? (chinese, not common)
What time does the store close?

몇시에개점 합니까?
What time does the store open?

토요일에는 몇시에 엽니까?
When does the store open on Sunday?