Unlock items or collections in the secret service.
The secret service may not be able to unlock items individually, and may unlock an entire collection instead.
If this is null, then [funcService.get] will be called to get the default
[classService] proxy.
This method may block indefinitely and should not be used in user interface threads. The secret service may prompt the user. [method
Service.prompt] will be used to handle any prompts that show up.
| this |
the secret service |
| objects |
the items or collections to unlock |
| cancellable |
optional cancellation object |
| callback |
called when the operation completes |
| user_data |
data to pass to the callback |