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hvsds
It looks like a yale G2000 locking mechanism with lever and movable pad handles.
Your inside handle will be working the upper spindle in the gearbox . 92mm above the cylinder (PZ92), which throws and releases the locking points and also pulls back the latch.
You have offset handles where the outside handle is 62mm above the cylinder (PZ62)works the lower spindle, which only throws and releases the locking points.
Turning the key, should pull back the latch(snib) and something has worn or getting jammed before the key goes far enough.
Replace the gearbox,
Replace the handles with PZ92 lever/lever on a straight through spindle would work, but that will mean anyone can open the door from outside if it's unlocked. *And something in the gearbox isnt happy, so maybe asking for a lockout in the future.