4 yo doesn’t want to pick up toys

My four year old daughter refuses to pick up her toys. Every time she is sent to pick up her toys she says she’s playing although she’s not. Today I finally told her you either pick them up or I’m putting them all in our storage, it backfired. I told her forget storing them I’ll sell them if you don’t pick them up and she said to just sell them. I’m really tempted to being how ungrateful she’s acting. I didn’t expect my plan to backfire now I’m not sure what to do. If I take them for a while and hide them she will just play with my three month olds toys. Any suggestions?