The expression reset($items); of type PleskX\Api\Struct\SecretKey\Info|false adds false to the return on line 40 which is incompatible with the return type documented by PleskX\Api\Operator\SecretKey::get of type PleskX\Api\Struct\SecretKey\Info. It seems like you forgot to handle an error condition.
This method seems to be duplicated in your project.
Duplicated code is one of the most pungent code smells. If you need to duplicate
the same code in three or more different places, we strongly encourage you to
look into extracting the code into a single class or operation.
You can also find more detailed suggestions in the “Code” section of your repository.