"Key" is the Engpsh equivalent for "钥匙".
"Key" is an Old Engpsh word that comes from the Germanic word "kǣi".
Examples:
Can you give me the key to your apartment?
(你能把你公寓的钥匙给我吗？)
I lost my car key.
(我把我的汽车钥匙丢了。)
The key to success is hard work.
(成功的关键是努力工作。)