I recently bought a very minty 1917 (32acp) but am having difficulty locking the slide back. I can't do it with my hands; I have to push the slide against the front of my workbench to get the slide to engage. Is this a lubrication problem or just the fact that the pistol hasn't been fired much. Is there a magazine available for this model that locks the slide back?

https://ibb.co/3cDLss6

https://ibb.co/HYZZ4st

https://ibb.co/D8V7DD2