Does our lien deadline extend if we continue to hold onto a property owner's possessions?

We provided CONTENTS PACKING HANDLING STORAGE LABOR & MISC services at a residential property in California. As part of the job, we were to hold onto the property owner's possessions until the project completed and we were paid. It has been 6 months since we were last onsite and still have not been paid.The property has now been placed into Pre-Foreclosure. Does holding onto these possessions as part of the agreed-upon work extend our lien filing deadline since the project has not yet completed? If not, what else can we do to get paid?