Lock on Idle Doesn't Work in Python Bindings

First of all I'd like to thank all you guys for this great OS.

Wile developing one of my applications I've faced a problem with Python bindings for Gnome Keyring Library. Everything works really fine unless the "lock on idle" feature. I couldn't find any examples on how to use this feature, not even in C, and as far as I understood, I need to set the lock_timeout and enable the lock_on_idle. I'm doing as the following:

>>> import gnomekeyring as gk
>>> import glib
>>>
>>> glib.set_application_name('MyApp')
>>> my_keyring = gk.get_info_sync('MyKeyring')
>>>
>>> my_keyring.get_is_locked()
False
>>> my_keyring.set_lock_timeout(10) #10 seconds
>>> my_keyring.set_lock_on_idle(True)
>>> my_keyring.get_is_locked() # after 60 seconds
False
>>> my_keyring.get_is_locked() # after 15 minutes
False
>>>

I repeated the test but instead of waiting with the "process opened" I closed it and after 15 min looked through seahorse and the keyring wasn't locked.

Is this really a bug or I'm misunderstanding the "lock on idle" feature? What's the correct approach?

I'm using Ubuntu 9.10, i386 architecture.
Best regards.