This isn't a lodger situation (which is differerent than a landlord tenant situation in california).
landlord must give proper notice to terminate tenancy. If tenant does not leave within alloted time, landlord files an unlawful detainer action seeking a writ of possession and an order to evict the tenant. If tenant doesn't leave, landlord seeks to have the eviction order fulfilled by the sheriff where they will physically remove the tenant and the landlord can throw any remaining possessions out the door.
So Matty9five1, do you want to make this simple or difficult? Either comply with the rules in place or face the consequences. You will ultimately lose because you are a tenant at will and have no legal right to remain in the room beyond the legally required notice of the termination of the tenancy.

