I presume that you don't have fold-down rear seats or you would not be asking how to get in. This is not an easy car to get into without damage.
My suspect is that the plastic lock in the top of the metal rod that runs from the key down to the lock has failed, and the rod has popped out. I have worn out a couple of those on e36 trunk locks, and broken one while doing other work on a door. It will be fairly easy to replace, once you get the door open.......
Be sure to disconnect the battery before pulling off the door panel, you don't want to loose a finger in the window mechanism, or have the air bag pop when you unplug it. DO NOT turn on the key while the air bag is unplugged or you will set a code that only a dealer or well-equipped shop can clear.
I am fairly handy with a slim Jim but I doubt I could open one of these doors. Open the trunk and disconnect the battery before you start, or the locking system will probably try to fight the slim Jim and will keep trying to relock itself before he can pull the door open. Perhaps the guy on the tow truck is better than I am with a slim Jim and all you will have to pay for is his trip to your house.