Toddler climbing out of crib

How do I deal with my 2yo climbing out of the crib? I’m not ready to deal with all the freedom that comes with putting on the toddler rail… The mattress is at the lowest level, but should I lower the mattress to the floor, still within the crib? Has anyone done that?

Also, he has an en-suite bathroom, how do I ‘lock’ the door to keep him from running the sink or bath?