My first thought is pyramidellid snail... but I think pyramidellids are much lighter(almost white) in color and have a 'pointier' shell similar to a cerith or trumpet. This shell is different.
Part of me also feels like it looks like a baby assassin snail? But it doesn't have the bright stripes. Hmmm!!
Fingers and toes crossed that we can get a snail expert in here.