I have to admit to feeling this way myself sometimes. I don't usually take Charlie Brown's tack to resolving it however, because... well, for exactly this reason.
In panel two, compared to the door, notice that Charlie Brown seems very small. There is no way he could reach the door handle. To state it plainly, usually the characters are drawn so they wouldn't have to reach up so far to reach doorknobs.
The text of ROASTED PEANUTS is copyright 2009-2011 by John Harris. No copyright is claimed over the comic strips, which are here under the principle of fair use. Strips presented for review purposes only. We love Peanuts a whole lot, and wouldn't dream of exploiting it. Please don't sue us; we're only trying to love. Thank you for reading this notice.