Fujica St605 - Shutter button stuck down

Hi
this morning I tried a Fujica St605 and the shutter button remained stuck at the bottom when I pressed it, why do you think?
the camera is unloaded, in the sense that it had not been loaded to take a photo and there is no film inside.
now how can I get it to return to its position?
if you try to wind it, to load the shutter, it is not possible because it resists and I tried imagining it was stuck.

Could try a drop of light oil, like sewing machine oil.

Buona sera, Rosssiiii;

actually I got me a Fujica ST 506 in Salisbury two years ago - it was working fine except the light meter. - Instead of having it repaired I simply bought a fully working ST-506 again; and I am very pleased with it and took many nice photos particularly in the Val Chiavenna in Lombardia.

Item: Buying another seems to be more economc than having done a repair.

Jan-Peter

Lake of Contance and Val Chiavenna