Training Dog Out of Going Through Trash Can

Alright we need some help. My fiances 5.5 year old Australian shepherd has been going through the garbages. Things we have tried:

• all garbages have lids
• all garbages that do not have a lock now have a child lock
• general supervision
• we are now onto increasing his play time with mind games etc but see below for added information

This is a new thing as of the last 4 months. Before now he has never been a problem – even with open garbage cans. But for some reason he is now going through the trash and unfortunately he's gotten food out and has rewarded himself. Does anyone have any way of training him out of this? We are going to give him more interaction and play/walk time but based on his behavior I think this is just something he is going to do now. We've done a day of intense play and he still went for the garbage. He gets fed with a puzzle for all meals as well.

Before anyone suggests it – we are not going to change what we put in the garbage or leave one out of his reach in the garage etc. We both have ADHD and it's just not sustainable – we are already struggling to remember to latch the damn child locks because when we turn our backs for 30 seconds he'll be in there if he thinks he can get away with it fast enough. Also – yes the child locks work but he is still able to get whatever is on the top because the lock allows maybe an inch of movement on one side and he's figured out he can move the garbage can away from the wall in order to exploit this.

Please help. I get the feeling even if we kept child locks on all the time he's going to start getting into other crap and I'm honestly worried for his safety. I know it's not an IF he gets something dangerous it's a WHEN. Unless we have our eyes on him 24/7 he's untrustworthy and that is so unsustainable 😞