How do I make an ownable door which gives an access card?

I want to make an ownable door that gives an access card to open it, the player can only own 1 door and 1 access card. How do I make it that when the player 'owns' a door it gives him an access card that goes to his starter gear, and how do I make it that he can only 'own' one door. Also how do I make it regen when the player leaves, thanks.