FALSE. NO ONE is permitted to walk into a apartment or House period with out warrant or unless someone is home.
Just cause a contract is signed and your renting, does not make the management above the law and just walk right into someones home. notice needs be given when its to take place and someone MUST be present to let them in.
Keys are given in the case you lock yourself out of the rented apartment. This gives them access to letting you in and for legal purposes. Eviction notices are done thought the court systems, so they cant walk right in with out legal paperwork stating they can.