If your BitLocker is locked, then you need to first know why something like that happened in the first place. But, the truth is that the reason why that would happen depends on several factors. First, it might be your PIN. if that’s the case, then all you have to do is reset it. Unlocking BitLocker can be done via a recovery key. Then, you can reset your PIN. if your PIN is not the issue, then you might need to use a backup recovery key, a USB, or contact an administrator for help.