When to use key in Korean
Korean: 열쇠[ yeol-soe ]

When to use it
A key is a small metal thing you use to open or lock a door, car, or box. In Korean, this word is 열쇠. People often use it when talking about going out, coming home, or looking for something important.
Example sentences
집 열쇠가 어디에 있어요?
Where is the house key?
저는 학교 사물함 열쇠가 있어요.
I have the locker key at school.
공원에서 열쇠를 잃어버렸어요.
I lost my key at the park.
엄마, 열쇠 좀 주세요.
Mom, please give me the key.
가게에서 열쇠고리를 샀어요.
I bought a key ring at the store.
여행할 때 호텔 방 열쇠를 받았어요.
I got the hotel room key when I traveled.