Pentax P3 Film camera (issue)

I got this and only got to shoot one roll of film. And suddenly the shutter just became “stuck” and wouldn’t shoot. Can’t advance the lever — didnt wanna force it to not risk breaking the lever. Wouldve been a fun camera. Can provide photos of the only roll I got to shoot it with. Probably a simple fix that I’m too stupid to figure out — perfect if you know your way around Film Cameras.