@Drezzy807 that is dependent on the server. A lot of servers auto lock the server above a certain round to prevent trolls coming in and ruining a run. You will have to find the owner of the server you are talking about and ask them how they handle that. Everyone is different.
Example: My servers have a voting system when it locks so the players can choose to unlock it to let folks in if they want and then relock it, but not all server owners do that. You'll have to find that owner to figure out what they do.