UPVC Door With ‘Mila’ Multipoint Lock Jammed Or Seized Up?

pejayuk asked:

I can’t open my front door. It is about 5 years old and the locking mechanism seems to be jammed up. It isn’t used very often and was last opened about a month ago. I can turn the barrel with the key although it is quite stiff. But then the handle won’t push down to release the bolts of which there are 3 on the edge of the door and one on the top.

I have tried removing the handle’s and spindle and spraying with WD40. Hasn’t done any good. When I try to push the handle down firmly, there is a clicking noise and it feels really stuck fast.

I don’t know who fitted the doors so I can’t claim under the guarantee. Anyone got any ideas of anything else I can try myself before I have to call a locksmith.