Repair of locking failure due to interference between deadbolt and strike

"The key does not turn unless a lot of force is applied when unlocking the door."

Well, how old is the property? Is it a cylinder that has deteriorated over time? I headed to the scene while thinking.

Still, it was a 22-year-old, six-story pencil condominium. The doors and cylinders didn't look that old, but they were disk cylinders (although the stainless steel shines).

The cylinder was a little stiff, but it could be improved with a spray wash. The problem seems to be interference with the deadbolt.

Pushing or pulling the door while turning the thumbturn or cylinder does not help. The top of the strike was interfering with the deadbolt.

That is, the door was installed too high up. Is the clearance with the deadbolt about minus 0.5mm?

Since both the case body and the strike are recessed, they cannot be adjusted.

When I checked the hinge, there was a big gap. However, the only way to adjust it is by raising the hinge or using the play in the screw on the hinge, but I don't have the space to use the hinge turning tool.

I was able to create some clearance by loosening all the hinge screws and lowering the door. Is the clearance about plus 0.3 mm to 0.5 mm? This is the limit. Beyond this, there is only a way to shave the top of the strike. This work will be postponed at this time. For a while, I waited and watched.