
You should contact your landlord and see if you can get written agreement for the additional day you need. Otherwise, I can not answer the questions you asked because they are more complicated than they sound and I would need more information to give you sound advise. I suggest that if you are worried about a lockout and cant make the agreement with your landlord, seek legal advice before the fact, a lawyer can advise you more fully upon reviewing your documents and circumstances.
Walter S. Jennings