Would verizon take my iphone 4 for the 6 trade in, if the lock button is stuck?

Please tell me?

Probably would, but wouldn't get as much

Phone must power up and off, must not have a broken or cracked screen and all buttons much function normally. And there can be no signs of water damage or corrosion.

Actually on trade in Apple takes them even if damaged, but of course you would get less if damaged as expected. You would have to call verizon to see if its the same rules with them.