Is locking a child in their room when misbehaving detrimental?

4.5 year old is a monster when over tired or hungry. My husband and I have slowly drifted into different parenting styles. I am more authoritative/use peaceful parenting methods (ex. No time outs) and he's more authoritarian. The child I'm speaking about is better behaved for me than my husband (husband agrees with me). This morning he locked him in his room with a key when he was misbehaving. I am livid.I have read how to talk so little kids will listen, the book has been offered to him but he hasn't touched it. Am I overreacting? Thanks for you input. via /r/Parenting https://ift.tt/2P3oBni