@JeremyECrawford can mage hand squeeze under a door? Asking for one of my players. Also, Binwin is still dead, FYI. Just sayin.
— Scott Kurtz (@pvponline) April 20, 2020
The mage hand spell doesn't get into the particulars of the hand's size, but I always imagine it as mirroring the caster's hand. So if the caster's hand could fit under a door, the spectral hand could go there too!
— Jeremy Crawford (@JeremyECrawford) April 20, 2020