Hey, welcome!
I don't know what could be causing this problem. Just to be sure I understand - the mirror moves out of the way normally, but the actual shutter courtains get stuck? But they close back down normally?
When you looked at it, was it clean, free of particles? If you have a rocket blower, you can try blowing on it, but actually for something to stop the shutter, it would have to be fairly big.
I would suggest you do the regular stuff:
1) Charge battery, leave it outside of camera overnight
2) Make sure the camera mount, battery contacts, and SD card slot are clean
3) Try a different battery and SD card
4) Try dust removal action
5) Try sensor cleaning action
6) Maybe try to update firmware?
Using B mode and forcing the shutter to go up all the way sounds risky to me, as you can easily scratch or dirty the sensor. And honestly, repairs might not be worth it - you can get a used K-50 for a really low price these days, and it has some more features and slightly better sensor than K-r. (and I say that with a heavy heart - the K-r was my first Pentax DSLR)
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