. Turn unit on the side and inspect brush assembly for dirt, hair, etc. , also check the condition of drive belt , be sure that it is engaged with brush roller and turning freely. Also check the option of the'suction release' valve near handle which may free brush movement. good luck.
Lubricate the wand near where it's stuck with a small amount of soap and water solution...small enough not to go any place it shouldn't. Then just wiggle it back and forth until it becomes free.