Okay, I do not remember much of this movie but the ending is pretty clear in my head.
At the end of the movie, it shows a school class on a trip to the museum and it shows the person from the museum talking about the artifact that had been a major point in the rest of the story.
when all the kids move away, one is left and he moves toward the object and smiles, revealing his teeth (i think it was a gap in his teeth) which resembled the villian from earlier, foreshadowing that the story wasn’t over.
I don’t believe it got a sequel but I can’t remember the movie at all.
If someone could help me that would be highly appreciated.