Clutch Pump faulty and couldn't shift in gear

As I was driving to King of Rims to get my alignment done, waited for almost 1 or 2 hours, finally it's my turn.

Gave the staff my car keys and he seem not be able to drive it, at first I wonder can he really drive a manual car (lols)....

Then he says he couldn't get in gear, then suddenly can and he drove it to the service bay. After the alignment process is finished and he drove out.

So once I paid the bill and try to drive out, it feels normal. Until halfway suddenly I faced the same problem as that guy did, couldn't get into gear. So my car slows down at highway then I'm force to stop at the emergency lane and asked for tow truck -_-.

Back to the shop and checked everything ....

No signs of faultiness, but actually I can still step in the clutch but I can't get into gear

Brand new master slave cylinder

My old master slave cylinder

Replacing this part solved the problem.