The  Rebuttal: Debunking the Conspiracy Theorists
 2.2 The exit door on the LEM is too small to allow for the egress / ingress of an astronaut in a space suit.
 
Actually, there are several photos in the NASA archives which show an astronaut half way out of the hatch!
üThe dimensions of the hatch are large enough to allow an astronaut fully decked-out in a spacesuit to get in and out of the LEM.