Lock management "by hand": example with early release of a lock

Hi,

I've a Jenkins job using pipeline and locks.
My Jenkinsfile looks like that:

```
[...]
lock(resource: 'mylock') {
parallel foo: stuff_for_foo, bar: stuff_for_bar
}
[...]
```

Of course, the lock is kept until foo and bar are both terminated.
I would like to know whether it's possible to release the lock as soon as one there is a failure (in either foo or bar).
Note: I'm aware of the "failFast" option of parallel step. However, I do not want to kill all branches in case of failure. Just to release the lock.

Is it possible to lock and release resources directly using API ? Perhaps using LockableResourceManager.lock(..) and LockableResourceManager.freeResources(...) programmatically ?

Any clue on this topic ?

Many thanks