Patio door handle just goes round and round when trying to open.

The door type is upvc.. the kind where if you turn handle halfway,
only the top of the door opens inwards .. turn handle all the way down
and all catches are released and door moves inwards and then you can
slide open.
I removed handle and the "bar" that goes into the opening mechanism.
Looks normal.

Is there a way to open the door now? There are two hex shaped
thingmebobs at the base of the door ... will they release the catches?

If I manage to get the thing open .. how much of the mechanism will
need replacing.

Loking on the bright side .. I am pleased it jammed shut in this
weather :-)

Mike P