Hello @adolalol and welcome to the community!
Sorry to hear about your loss. Sadly, no one in this community can help you lock your phone, as this is an international user-based forum. But you can try either of these services to lock, erase, or locate your missing phone, provided that it's still turned on and connected to the internet:
- Android Device Manager
- MyXperia Theft Protection
On a side note: for your own privacy, do not publicly post any sensitive information about your phone (like IMEI number).
