Does a search warrant entitle police to search all of apt and bedrooms even when bedroom is locked and that person isn't on the warrant?

NO. The warrant is issued for specific items to be siezed and specific locations to be searched. There has to be SPECIFIC listings as to what is sought and what areas are to be searched. That is in the U.S. Constitution as part of the 4th amendment, it does not vary. For example, if the officers are searching for a stolen television set, they cannot legally search inside your jewelry box. However, if authorities find illegal items that do not relate to the case in question those items can be siezed if they are illegal and were found legally during the search. Locked or unlocked does not matter, if it is on the warrant to search for the items, it can be done. However, if a person lives in an apartment where he/she gives consent to search, he/she cannot give consent to search rooms they do not live in.