锁头已开启用英语可以说成 "The lock has been unlocked."
这个短语来源于英语中的动词 "unlock"，意思是"开锁"。
例句：
I unlocked the door and walked into the room. 我把门开了，走进了房间。
Can you please unlock the car so we can get in? 你能把车开锁吗，这样我们就能进去了。
She unlocked her phone and checked her messages. 她解锁了手机，查看了信息。