Saw this on TV in the mid-90s, but i was 6 or 7, so I only remember two scenes. In the 1st scene, some families are outdoors having a picnic or a party; a little girl is playing with a ball, and it rolls away from her. She follows, and it appears the ball has dropped down a hole in the ground but it is given back to her by the monster (which isn't shown). The second scene is at the end, where a guy is hunting the monster in what looked like a factory, or a warehouse. The guy may have been wearing a biohazard suit. I remember the monster had brown, glistening skin and appeared to be a humanoid figure, but I'm not sure.
The movie was probably from the 80s, but could be early 90s or even 70s (it was color). Would really appreciate any suggestions, thanks.