Blake Borham

Recently bought a 2004 A4 B6 with 119000kms on it fully serviced. Both rear doors won't open from the inside or outside. I suspect the car has been sitting idle for some time as has only covered 10000kms in the last 5 years .
The key fob opens and locks the front doors no problems.
What could be causing the issue with the rear doors? Dust build up?
child locks on?
latch half open half closed?
Does anyone know a quick fix?

thanks in advance