1972 Ford F100 Stuck in gear. Manual transmission?

1972 Ford F100.
it has a 3 speed manual transmission, and a few times while i was driving it wouldn't come out of gear. A couple aggressive swings of my arm and it popped out. But it has done it again and i can't seem to get it back to neutral. Its in second gear, and i can still drive it. Clutch is engaging fine i believe. But i physically can't get the shifter out of 2nd gear.
Its not hydraulic. Clutch, and transmission are both 100% mechanical

I'm about to go get under it and see if i can't find the adjustment. I'm only 21 so my 42 year old truck confuses me sometimes.

Make sure that the clutch is disengaging completely - It might need a adjustment.