Hello Tien,
Thank you for trusting us by participating with your questions.
I am an Independent Advisor and it will be a pleasure to help you today.
In response to your question I will drop you a link that walks you through what .lock files are and how they can be opened.
https://filext.com/file-extension/LOCK
Note: This link is not a Microsoft Website. It seems to contain correct and secure information. Please be careful with advertisements on the site that may be promoting products classified as PUP for their meaning in English (Potentially Unwanted Products). Please do not download anything from that site.
I hope you solve your inconvenience as soon as possible. Any other questions here I will be able to help you.
Enjoy the rest of the day.