How to get new keys

[nalaka.hewage]

I recently moved to a new house and I find this lock in all the internal doors but no keys.

Can you please let me know how I can make new keys. Do I have to have different keys for each door or will it be the same (universal) key for all the doors?

Thank you
Nalaka

 

[Dilato]

My guess is that it is a very common key, Assa lock 404 key #2
https://www.nyckelbutiken.se/nycklar/innerdorr/assa-nyckel-404.html

 

[123abc]

There used to be different keys numbered 1-4 but now there's an universal key.
ASSA key 404, an locksmith, hardware store and so on has keys for that lock.