I have a problem on Minecraft with the protections and doors. That won't open even though their our own

We have joined this server since a few days ago we made a huge house and the problem we had at the end suddenly was that the doors weren't working to open. I remember we went on to adventure around and then came back I think it had something to do with that. We can't find an admin at all so we left that house to be destroyed by whoever wants the items. Then moved on to make new ones again the issue came back after a while and i'm not sure what is going on. Has anyone dealt with this? Is there anyway to fix it? I don't want to deal with moving all over again because of these doors not working… Please help if you know anything Thank you.

Added (1). May I also mention they keep saying they're protected by a magical spell even though their our own.

Why don't you just break the door?

It's hard to answer this question since it really could be because of a number of reasons depending on what server you are on.

We can't really help you there. This is clearly an issue with the server, only the server admins/moderators and assist you with that.

If it's a public server then maybe they have a website or a forum you can use. There should be a contact page or a help thread you can use.