Problems with lock and electric window - VW Polo

I have a 1998 VW Polo 1.4L. Recently I have been unable to lock or unlock the door on the drivers side, and the back door/boot has also jammed shut. I can unlock and lock the car on the passenger side. Just very annoying having to do this each time I get in and out of the car!
Furthermore - I have a problem with the electric window on the driver side - It goes down fine, but once it is more than half way open, it won't go back up again. I have managed to edge it up to the top gradually by turning the ignition off then on again, then the window will go up a an inch or so at a time before having to repeat the process.

I'm not sure if the 2 problems are linked. Someone has advised me that the lock and window may just need some oil, but thought it may be a problem with the electrics.

Can anyone advise?