How can I reset it when it can't open?

SOURCE: LG8300 stuck vibrating continuously, now main screen blank

Sounds like water damage. Are there any red stickers under the battery? If so, then it is water damaged.

Either way, if you are the primary line then Verizon may offer you an early upgrade if your rateplan is above a certain price point (if that's who your on). If not, you can do an insurance claim, if you don't have insurance then you will have to either pay full price for a new one, or purchased a used one.

Hope this helps,
Simon.

SOURCE: vibration only vibrates once

You will have to change the ringer under sound settings to "Vibrate and Ring", it is currently set on "Vibrate Then Ring".

Hope this helps,
Simon.

SOURCE: Message Vibration not working

make sure you have "txt messages" set to ring/vibe not "calls to line 1 ring/vibe"

SOURCE: vibrate stopped working

Pls check your battery power if it has gone out. If the battery has gone out then phone might not be able to draw enough power from it when vibration mode is on.

SOURCE: LG env3 alarm clock vibrate

Yeah, I had that problem too. I thought my phone was broken. -_- My old phone from Verizon is like 4 years old and I JUST got my enV3. On my old phone, I'd have to set the alarm's ringtone to "no ring." But, on my enV3, "no ring" literally means NO ring, no vibration, no notification, no nothing. On the enV3, in order to set your alarm clock to vibration mode, all you have to do is make sure you "master volume" is in vibration mode, but you have to set your alarm's ringtone to something other than "no ring."