Any of the less expensive bedside safes are pretty easy to open. There is nothing foolproof. The best thing you can do is figure out what your needs are and pick something that will meet those needs. If it's just a bedside safe to keep a gun nearby and keep it out of the hands of the kids, really, any of the smaller, cheap, safes will work, as long as you're putting the gun somewhere more secure (wearing it, or a more secure safe) once you wake up.
If this is something you're planning on storing a gun in, get something high quality that's harder to get into.