2005 subaru legacy,front door drivers side stuck shut.lock mechanism seems jammed,how do i get the door open?

I everyone

I had the same problem with my Forester 2004. I could not use my kee or my remote . So i had to get the door to open first to remove the inside panel to lubricate the door lach from the inside, need to remove the white plastic cap and you will see the mecanisim just lubricate the spring with the leaver that as the connecting rod attached to it and the problem is fixed.
The problem came from the andle

If you cannot open it from inside, take the door panel off and try to unlock it manually (if not power locks) If you do have power locks, pop the hood, and disconnect the positive terminal on the batter (make sure you have any codes needed (if required) for stock stereo system; your owners manual will explain this, as these codes (or code) is needed to enable the stereo). This is an anti-theft option for newer vehicles, but are not necessarily equipped. If you manual does not specify if your vehicle has this, check with the dealership of purchase.
If not, or if you obtain the codes, go ahead and disconnect the positive terminal. I once locked my keys in my 1990 Ford F250, with power locks - luckily, my hood was up as I was doing some minor repairs, and decide to give this a try. Once I disconnected the positive it popped all the locks (two door).
If this does not work, I suggest inquiring with the dealership, or google it.
Please let me know if you need further assistance.
carsandcomps,
Guru, Premium Expert @ Fixya.com