FYI -
As described, there are very specific ways for things to be done and might not be entirely obvious.
Although also likely available online,
You can install the complete subversion “book” which should be relevant although written for 1.8
zypper in subversion-doc
It’ll describe numerous ways to set up security, so you’ll have to figure out what documentation applies to however you’re set up.
If helpful, there is a specific part of the documentation about locks you can read…
Once installed, it’ll be at the following URL
file:///usr/share/doc/packages/subversion/html/book/svn-book.html#svn.advanced.locking
TSU