Can the police enter my home just because the door is unlocked even if you tell them not to without a warrant?

Generally, police cannot enter your home without a warrant, consent, or exigent circumstances, even if the door is unlocked. If you explicitly tell them not to enter, that further reinforces your privacy rights. However, if they believe there is an immediate threat or evidence is being destroyed, they may have grounds to enter without a warrant. It's important to know your rights and seek legal advice if you have concerns about police conduct.