No! Regardless of what anyone will tell you.
People that don't know real estate law think that if you don't have a lease, you have no rights....that is NOT true.
A statutory lease (regulated by law) takes over in the absence of a written one. In all states, they require a minimum of a 30 day notice (or longer, but 30 is the minimum), and a landlord cannot resort to self-help measures, such as changing the locks, etc.
A landlord MUST go to court to obtain an eviction...anything else is an illegal eviction and then the landlord can be sued for damages, and in some cases, TREBLE damages.
PS: Short term squatter's rights are rarely enforced in court...because as soon as you break into a residence/building, you have trespassed and are guilty of breaking and entering...both of which are CRIMINAL charges.
Squatter's rights are usually when a landlord will allow for someone to remain on a property for an extended period of time and not pay rent, and it prevents the landlord from starting to scream that they suddenly want them out.
The law does NOT reward people for breaking the law. A landlord who is absent from a property can pick up the phone, call the police, and have someone removed from a property that entered it illegally. The fact that the "squatter" has a right to be there, is a real estate urban myth.