i had the same problem,only my door was two year old,it is a milla locking system,but as the door was not bought by me but from a firm that went bust,i lost the gaurantee.will cost about £70,the way the door had been fitted it caused wear and something crumbled.
as with most of these doors you should be able to get at the hinge pins
tap these upwards and the pins should come out, you can then remove
the door from the hinge side
I lost my key to the patio door and called out a locksmith which cost £70.00. All he did was drill out the lock and removed the affending article which can then be replaced with another lock purchased at nay DIY store. Much cheaper than £70.00
as with most of these doors you should be able to get at the hinge pins
tap these upwards and the pins should come out, you can then remove
the door from the hinge side
When the main lock is engaged on some of these doors, bolts are also thown into the top/bottom rail of the door frame. Severe damage can result, requireing complete replacement.
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