New Jersey law prohibits self-help evictions, which is what your landlord is threatening. Without a special court order, called a"warrant for removal", no sheriff will assist her in locking you out of your apartment, but should she try to lock you out on her own anyway, she could be found guilty of a disorderly persons offense, You must be provided a copy of this warrant for removal at least three days before the scheduled lockout. Should your landlord try to lock you out, you should call the police, who are required to prevent the landlord from completing the lockout and to charge the landlord with the violation of N.J.S.A. 2C:33-11.1. There is one more piece of information you need to be aware of: while New Jersey's Anti-Eviction Law usually favors tenants, in the case where a tenant has notified the landlord of his intention to vacate the premises but then realizes he needs more time before moving out, the landlord may be entitled to DOUBLE the monthly rent until you do move out. Therefore, you will need to weigh your options very carefully. I hope this helps to clarify your rights and obligations.
The landlord needs to take you to court to evict you and can not evict you without a court order.
The above answer is only for information. This answer and any response does not create an attorney-client relationship between the parties and the communication is not privileged and confidential. The best course of action is to consult with a lawyer about your specific case. If you need to contact me, please call at 212-537-6936 or email at email@example.com