Cant set reserve/unlock permissions programmatically

Faced this while trying to automate the Jenkins deployment. I am trying to set permissions for the plugin actions like below

```
import jenkins.*
import jenkins.model.*
import jenkins.model.Jenkins
import hudson.*
import hudson.model.*
import hudson.security.*
import hudson.plugins.git.*
import jenkins.model.Jenkins
import hudson.security.ProjectMatrixAuthorizationStrategy

def instance = Jenkins.getInstance()
println 'Setting up ldap'
String server = 'ldaps://ldap.company1.com'
String rootDN = 'dc=company1,dc=com'
String userSearchBase = ''
String userSearch = 'company1UnixUsername={0}'
String groupSearchBase = ''
String managerDN = ''

String managerPassword = ''
boolean inhibitInferRootDN = false
SecurityRealm ldap_realm = new LDAPSecurityRealm(server, rootDN, userSearchBase, userSearch, groupSearchBase, managerDN, managerPassword, inhibitInferRootDN)

instance.setSecurityRealm(ldap_realm)
def strategy = new ProjectMatrixAuthorizationStrategy()

strategy.add(org.jenkins.plugins.lockableresources.LockableResourcesManager.UNLOCK,'User1name')

instance.setAuthorizationStrategy(strategy)
instance.save()
```
It throws

```
groovy.lang.MissingPropertyException: No such property: UNLOCK for class: org.jenkins.plugins.lockableresources.LockableResourcesManager
at groovy.lang.MetaClassImpl.invokeStaticMissingProperty(MetaClassImpl.java:1002)
...
```
See full stacktrace attachd

Same error for RESERVE

I've found something very similar[ here in comments](https://issues.jenkins-ci.org/browse/JENKINS-54541) and the answer there was that

> this bug will be covered by that bugfix (PR#117) as well

and as far as i understand that PR has been included into the latest release (2.7) that i'm using currently.

Also i've found [same question at stackexchange](https://stackoverflow.com/questions/57399251/is-there-a-way-of-adding-lockable-resources-permissions-to-a-jenkins-role-via-a)
[JstackTrace.pdf](https://github.com/jenkinsci/lockable-resources-plugin/files/4317826/JstackTrace.pdf)