No landlord or landlord's agent may engage in self-help eviction practices, as defined in Section 9-1602 of this Chapter, under any circumstances, in the City of Philadelphia. The requisite, legal process for lawful eviction must consist of execution of a judgment of possession entered by a court of competent jurisdiction in accordance with State law. Lawful execution of judgment may be performed only by a Sheriff or court-appointed landlord and tenant officer.