I have a reverb plug-in named "TL Space" which can mimic lots of stuff.
I have used it to create voices sounding like they are inside a deep sea diver helmet, inside a car, in a glass booth, in a missile silo, etc. etc.
"ReVibe" is another one I've got which has a bunch of "Post Production" presets that you can use.
Also, you might take a speaker and play the audio out of it and "re-mic" it so that you get that early reflection of glass or whatever you want. You can either use that recording by itself or mix it in with the original but you have to make sure the audio is in phase and not cancelling itself out when you combine them.
That's one thing the sound designer/mixer of Cast Away did for the shots of him yelling to the ship that he sees way far away: He played Tom Hanks' recordings through a speaker in the surrounding countryside at Skywalker Ranch and they got that slap echo of the forest that they wanted. The neighbors also called the cops because they obviously heard someone yelling "HEY!!! HELP ME!!! I'M OVER HERE!!! COME BACK!!! PLEASE HELP ME!!!"