The marshal will have id and presents proof of a warrant of eviction. The marshal can use force to enter the apartment if you refuse to let him in. They may do an eviction or a possession.
Possession — the marshal will order you to leave the apartment and change the lock. Your things will stay in the apartment. Go to court to get access to your things. If you don’t the landlord can move your things to storage.
Eviction — The marshal removes everything from the apartment and puts it in storage.