Symfony sfPDOSessionStorage - manually destroy / regenerate session

Question

I am using sfPDOSessionStorage with symfony. I need to destroy and regenerate a user's session. Is there any function that allows me to do this?

Using session_destroy(); session_regenerate_id(); session_start(); obviously doesn't work because it would bypass the database storage.

I've tried directly calling:

getContext()->getStorage()->sessionDestroy(session_id());

which works, but the session_id is still persistent.