Question of the day - Knocking and entering

 

Is it normal to enter a house if you knock on the door and noone answers? Do you really have to lock your door with a key to keep neighbors from entering?

It's great that neighbors feel so comfortable that they enter your house whenever they want to, but it's not always you want to have visits.

If you have a big glassdoor facing the front garden, that you sit right next to the whole day, should it be necessary to lock it with a key everytime you go to the kitchen or the toilet, just to keep the neighbors from coming in and surprising you in the toilet?

And the funniest part of all is when they ask you why you did not lock the door. Does that mean you have the right to enter any door that is unlocked?!?

Just wondering...