PrisonCells is the most bespoke cell plugin. It uses GUIs to control it and is 100% configurable.
If you go to an empty cell, and right click the door it will present you with a GUI allowing you to buy the cell.
Once bought, a cell that you own, when you shift right click the cell it will present another GUI that will have a detailed control panel for that cell which will enable you to add members, select the door delay and much more. If you simply right click a door you own, it will open the door.
If you right click a cell you're a member of, the door will open. (Assuming the owner of the cell kept members opening your doors enabled (It's found in the member manager)).
If you shift right click a cell and you have the permission, you will view the admin GUI which will present you information regarding the cell and also allow you to add more rental time to it aswell as being able to unclaim it from the user. If you just right click a cell, you will open the door (While being having the lock bypass permission)